Transact SQL :: Check For Existence Before Inserting
Nov 3, 2015
I have a webpage where users can connect with other users by sending them a request. Sending the request just puts a row in a connect table that contains the users id, the targetusers id, a requesteddate, an accepted date and a disconnectdate (for the original requester to end the connection and a reject bit the the target can reject the request. Hoever I need to check to assure that the connect does nt already exist either as pending (requestdate is not null and accept date is null) or both dates are not null (connection already complete.).
ALTER PROCEDURE [dbo].[requestConnect]
-- Add the parameters for the stored procedure here
@requestor int,
@requested int
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from interfering with SELECT statements.
[Code] ....
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Oct 8, 2015
I'm trying to figure out the best way to write a script to deploy environment variables to different servers. To create the variable I'm currently using catalog. create_environment_variable. I want to wrap that in an if not exist statement.I had thought about just blowing away all the variables and recreating them but I thought that wouldn't go over well in prod. I wasn't sure if by deleting the variable, references to the variable would be lost.
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Jun 23, 2007
Dear All,
I wanted to know how do I know or check that whether a column exists in a table. What function or method should I use to find out that a column has already exists in a table.
When I run a T-SQL script which i have written does not work. Here is how I have written:
IF Object_ID('ColumnA') IS NOT NULL
ALTER TABLE [dbo].[Table1] DROP COLUMN [ColumnA]
GO
I badly need some help.
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May 8, 2006
Apologies if this has been answered before, but the "Search" function doesn't seem to be working on these forums the last couple of days.
I'd just like to check if a table already exists before dropping it so that I can avoid an error if it doesn't exist. Doing a web search, I've tried along the lines of
"If (object_id(sensor_stream) is not null) drop table sensor_stream"
and
"If exists (select * from sensor_stream) drop table sensor_stream"
In both of these cases I get the error: "There was an error parsing the query. [ Token line number = 1,Token line offset = 1,Token in error = if ]"
Sooooo... what is the standard way to check for existence of a table before dropping it? Someone help? This seems like it should be simple, but I can't figure it out.
Thanks in advance!
Dana
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Jun 5, 2007
Check the field existence of a database table, if exist get the type, size, decimal ..etc attributes
I need SP
SP
(
@Tablename varchar(30),
@Fieldname varchar(30),
@existance char(1) OUTPUT,
@field_type varchar(30) OUTPUT,
@field_size int OUTPUT,
@field_decimal int OUTPUT
)
as
/* Below check the existance of a @Fieldname in given @Tablename */
/* And set the OUTPUT variables */
Thanks
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Nov 27, 2000
we tried out the following code in query analyser -
create procedure TrialProc
as
select * from sakjdhf
when we executed this piece of TSQL in query analyser, we expected it to give an error or warning that no object by the name of sakjdhf exists ( as actually there is no such table or view in the database ). however to our surprise we got "command completed successfully " !!
does this mean the SQL server does not check for necessary objects when creating a stored procedure ? or is there some setting that we missed out whihch is causing SQL server to overlook the error in the code ?
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Jun 13, 2006
This function, F_TEMP_TABLE_EXISTS, checks for the existence of a temp table (## name or # name), and returns a 1 if it exists, and returns a 0 if it doesn't exist.
The script creates the function and tests it. The expected test results are also included.
This was tested with SQL 2000 only.
if objectproperty(object_id('dbo.F_TEMP_TABLE_EXISTS'),'IsScalarFunction') = 1
begin drop function dbo.F_TEMP_TABLE_EXISTS end
go
create function dbo.F_TEMP_TABLE_EXISTS
( @temp_table_name sysname )
returns int
as
/*
Function: F_TEMP_TABLE_EXISTS
Checks for the existence of a temp table
(## name or # name), and returns a 1 if
it exists, and returns a 0 if it doesn't exist.
*/
begin
if exists (
select *
from
tempdb.dbo.sysobjects o
where
o.xtype in ('U')and
o.id = object_id( N'tempdb..'+@temp_table_name )
)
begin return 1 end
return 0
end
go
print 'Create temp tables for testing'
create table #temp (x int)
go
create table ##temp2 (x int)
go
print 'Test if temp tables exist'
select
[Table Exists] = dbo.F_TEMP_TABLE_EXISTS ( NM ),
[Table Name] = NM
from
(
select nm = '#temp' union all
select nm = '##temp2' union all
select nm = '##temp' union all
select nm = '#temp2'
) a
print 'Check if table #temp exists'
if dbo.F_TEMP_TABLE_EXISTS ( '#temp' ) = 1
print '#temp exists'
else
print '#temp does not exist'
print 'Check if table ##temp4 exists'
if dbo.F_TEMP_TABLE_EXISTS ( '##temp4' ) = 1
print '##temp4 exists'
else
print '##temp4 does not exist'
go
-- Drop temp tables used for testing,
-- after using function F_TEMP_TABLE_EXISTS
-- to check if they exist.
if dbo.F_TEMP_TABLE_EXISTS ( '#temp' ) = 1
begin
print 'drop table #temp'
drop table #temp
end
if dbo.F_TEMP_TABLE_EXISTS ( '##temp2' ) = 1
begin
print 'drop table ##temp2'
drop table ##temp2
end
Test Results:
Create temp tables for testing
Test if temp tables exist
Table Exists Table Name
------------ ----------
1 #temp
1 ##temp2
0 ##temp
0 #temp2
(4 row(s) affected)
Check if table #temp exists
#temp exists
Check if table ##temp4 exists
##temp4 does not exist
drop table #temp
drop table ##temp2
CODO ERGO SUM
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Oct 26, 2007
I have a data flow task inside a foreach loop container which will take multiple excel files and load into a sql table. Once all the excel files are loaded into the table, then at the end one of the column gets updated using execute sql task. Now I am trying to check for a file existence, if the file is not present in the folder then the data flow task should not be executed. Any help is greatly appreciated, I am thinking of using file system task for this, but not exactly sure. Thanks in advance.
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May 17, 2005
Hi,
Can someone please tell me the best practices for checking the primary key field before inserting a record into my database?
As an example I have created an asp.net page using VB with an SQL server database. The web page will just insert two fields into a table (Name & Surname into the Names table). The primary key or the Names table is "Name". When I click the Submit button I would like to check to ensure there is not a duplicate primary key. If there is return a user friendly message i.e. A record already exisits, if there no duplicate, add the record.
I guess I could use try, catch within the .APSX page or would a stored procedure be better?
Thanks
Brett
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Jul 23, 2005
I developed a console application that will continually check a messagequeue to watch for any incoming data that needs to be inserted into MSSQL database.What would be a low-cost method I could use inside this consoleapplication to make sure the MS SQL database is operational before Iperform the insert?
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Nov 26, 2007
Hi Friends,
I am Ravi, I need a help.
My case is like.. i need to upload data from csv file into sql server 2005 data table.
but before that I need to check integrity of data
for example:
let us say csv data is like
ISD CODE,STATE,NAME,QUALIFICATION
91,AP,KIRAN,MCA
01,MC,MIKE,MS
here i have to check that, wether there is an entry in ISD codes table for 91 and 01 (india and us)
similarly AP , MC (Andhra Pradesh and MISSICippi)
please suggest me a nice approach, no of records in ISD codes and States will 350-450 records.
thanks in advance
Ravi K
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Aug 12, 2014
I have the following objective:
1. I want to check a column to see if there are values (to Eliminate dups)
2. Once checked the values in a column, if not found insert the new value
Here is my code for this:
ALTER TRIGGER DUPLICATES ON AMGR_User_Fields_Tbl
-- When inserting or updating
AFTER INSERT, UPDATE AS
-- Declare the variables
DECLARE @AN varchar(200)
[Code] ....
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Aug 12, 2015
I am working on moving information from one of our databases into a newer one the company has recently setup. I am working in MS SQL Server 2012 and am trying to Inset/Update (depending on the information) a part table. I will list the two tables I am working on as Old (where I am getting the information) and New (where it is to be inserted into).
The old table has about 250 columns of information, most of which is not needed. The needed information is as follows: Name, ID, Component1, Component1_PIN,Component1_SN, Component1_Description, Component2, Component2_PIN, Component2_SN. The component section repeats up to Component12.
The new table has columns setup as such: Name, ID, Case, CasePIN, CaseSN, Case_Desc, Processor, ProcessorPIN, ProcessorSN, Processor_Description, Memory, MemoryPIN, MemorySN, Memory_Description, etc.
The issue I am having is that in the old table each component can have Case, Processor, Memory, etc in that one column. I need to insert Case, Memory, etc into the correct column in the new table while keeping intact the rest of the information.
Example:
Old Table
Name | ID | Component1 | Component1_PIN | Component1_SN | Component1_Description | Component2 | Component2_PIN | Component2_SN | Component2_Description
Nest8 | 5682 | Case | 901834 | 237848117 | Black, rectangular | Memory | 9081234 | 5398798134 | NULL
Nest8 | 5978 | Case | 901463 | 237848138 | Black, rectangular | Processor | 2394875 | 2903857809 | Bad
Reds3 | 5683 | Memory | 2405 | 89752342 | Crucial | HardDrive | 92387595 | 457982234 | NULL
Bass | 5644 | HardDrive | 79872346 | 5321675789 | NULL | Case | 10984528 | 3498769872 | NULL
I am not sure how to loop through and grab each part and place it in the column it needs to be while keeping it with the ID.
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Aug 20, 2006
I am using Visual Web Developer Express 2005 and SQL Server Express 2005.
I have set up a trigger that fires when an update has been performed on a specific table. The trigger checks to see if specific columns have been updated. If they have, then the trigger code is executed. This part works fine.
I am now trying to find a way to check if null values exist in either one of two field from the same table. If either field contains a null value, then I don't want the trigger code to be executed.
How can I check for null values and skip a block of code within my Transact Sql trigger.
Thanks.....
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Jul 24, 2015
I have included in the attached SQL:
Declare @table1 table
(
cnsmr_id int,
complainid int,
complaintstat varchar(10)
)
Insert into @table1
[Code] ...
The query should return only cnsmr_id=2 since all the complaints is closed (blank/NULL) i have achieved this using having but is there is more performance way of doing this?
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Sep 29, 2015
How can I check the overlapping in a simple table like:
Create table forum (cid int, bfrom date, tfrom date, fval int)
Insert into forum values (1, '2014-01-01', '2014-01-31',10),(2, '2014-01-01', '2014-01-31',12),(1, '2014-02-01', '2014-02-28',8),(2, '2014-02-01', '2014-02-28',6),(1, '2014-03-01', '2014-03-31',11),(2, '2014-03-01', '2014-03-31',5),(1, '2014-04-01',
'2014-04-30',14), (2, '2014-03-01', '2014-04-30',12)
In the example above there is an overlapping for the cid 2 in March. How can I check, which select should I apply?
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Jul 20, 2015
I'm wondering if its possible to return the number of files in a folder suing something like DIR command.I'm wanting to do something like, If count(DIR) >0 then do something
else End
exec master.dbo.xp_cmdshell
'dir C:Test'
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Aug 19, 2015
I have 2 tables: Source Table - IncidentDimNew and Destination Table - IncidentDimNew with identical columns: Id and CreatedDate but the data is different.
I would like to insert distinct data from those 2 columns of 1st table into the same 2 columns into the 2nd table but I onlt want to replace the values in the 2nd table where the Created Date is > 2015-04
I compiled the code in order to get the information I want from 2 tables:
Source Table
SELECT
COUNT(Id),
LEFT(CONVERT(VARCHAR(10)), CreatedDate, 126), 7)
FROM
IncidentDimNew
[Code] ...
This is the code I wrote in order to do it
INSERT INTO IncidentDim
[Id]
,[CreatedDate]
SELECT
[Id]
,[CreatedDate]
FROM
IncidentDimNew
where left(CONVERT(VARCHAR(10), CreatedDate, 126),7) > '2015-04'
GO
But what it does it's gives the SUM of the values in the corresponding rows where the values are not null which I don't want.
So how do I leave the values as is from table IncidentDim and insert new values as it is from IncidentDimNew where the Created Date is > 2015-04?
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Sep 17, 2015
How to modify values in a SQL Database. In the table PRDDEmpmaster there is a field called email_address, and for those fields that have a value I need to change that value to add { } opening/closing "curly braces" to that field.
For example,
RPARSONS@YAHOO.COM becomes
{RPARSONS@YAHOO.COM} . Nulls/empty fields remain as is.
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May 12, 2015
I am trying to write a SQL Server query that archives x-days old data from [Archive].[TestToDelete] to [Working].[TestToDelete]table. I want to check that if the records on ArchiveTable do not exist then insert then deleted...which will be converted to a proc later.. archives x-days old data from [Working].[TestToDelete] to [Archive].[TestToDelete] table */Here is the table definition, it is the same for both working and archive tables. There are indexes on: IpAddress, Logdate, Server, User and Sysdate (clustered).
CREATE TABLE [Archive].[TestToDelete]([Server] [varchar](16) NOT NULL,[Logdate] [datetime] NOT NULL,[IpAddress] [varchar](16) NOT NULL,[Login] [varchar](64) NULL,[User] [varchar](64) NULL,[Sysdate] [datetime] NULL,[Request] [text] NULL,[Status] [varchar](64) NULL,[Length] [varchar](128) NULL,[Referer] [varchar](1024) NULL,[Agent] [varchar](1024) NULL) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]/* the syntax, which will be converted to proc is: */SET NOCOUNT ON;DECLARE @Time DATETIME,@R INT,@ErrMessage NVARCHAR(1024)SET @R = 1/* set @Time to one day old data */SET @Time =
[code]....
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Aug 20, 2015
Basically, I have a membership table that lists each member with an effective period, Eff_Period, that indicates a month when a member was active. So, if a member is active from Jan to Mar, there will be three rows with Eff_Periods of 201501, 201502 and 201503.
All well and good.But, a member may not necessarily have continuous months for active membership. They might have only been active for Jan, Feb and Jun. That would still give them three rows, but with noncontinuous Eff_Periods; they'd be 201501, 201502 and 201506.There is also a table that logs member activity. It has an Activity_Date that holds the date of the activity - betcha didn't see that comin'. What I'm trying to do is determine if an activity took place during a period when the member was active.
My original thought was to count how many rows a member has in the Membership table and compare that number to the number of months between the MIN(Eff_Period) and the MAX(Eff_Period). If the numbers didn't matchup, then I knew that the member had a disconnect somewhere; he became inactive, then active again. But, then I thought of the scenario I detailed above and realized that the counts could match, but still have a discontinuity.So, is there a nifty little SQL shortcut that could determine if a target month is contained within a continuous or discontinuous list of months?
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Oct 14, 2015
I am using aloha POS and they have the date for every check in separate fields and now I want to calculate the total time for the checks but unable to get the how of it..
The date is DOB and it's datetime but I just need to extra the getdate() from it.The open time is OPENHOUR and OPENMINThe close time is CLOSEHOUR and CLOSEMIN
so basically the open time for the check will be the DATE FROM DOB + OPENHOUR + OPENMIN
And the close time will be DATE FROM DOB + CLOSEHOUR + CLOSEMIN
How can I get the total minutes for the check?
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Sep 14, 2015
I want to check that no inserts are occurring in 5 tables that are depending on each other and then drop and create those 5 tables. I have scripts to drop and recreate the tables. How do I check that no inserts are happening in these 5 tables?
Table A
Table B dependant on
Table A
Table C dependant on
Table B
Table D dependant on
Table C
Table E dependant on
Table D
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Apr 25, 2015
I have a SQL Server 2005 DB in which a design change requires me to drop a column.Is there a way of identifying all references in the DB including functions & stored procs's that reference this column? I understand there are 3rd party products that can do this but was wondering if there was something baked into SQL Server itself.
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Nov 2, 2015
Is it possible to check if the date has been formatted as dd/mm/yyyy i.e. something like this...
if (@EnterDate <> dd/mm/yyyyy )
SET @message = 'date not in the correct format'
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Aug 21, 2015
query that checks to see if a variable contains special characters; except for hyphens, periods, and accents?
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Aug 5, 2015
I have a table that keeps track of all changes that were performed in an application. There is a column called "old value" and column called "new value". There are some values in the application that don't require data therefore the "old value" or "new value" values can be empty. These columns are an nvarchar data type because the value can be text or numbers or dates. An example is "ReceivedDate". There is a report that is generated based on this table.
What is happening is the query in the report dataset is adding dates when it should be displaying empty. They query is using "CASE/WHEN/THEN". What I need is "When the column is "RecievedDate" and it is not null then convert it to a date". This is for formatting purposes.
This is an example of the table:
UpdateColumn
Old Value
New Value
ReceivedDate
7/8/2015 5:00:00 AM
ReceivedDate
7/8/2015 12:00:00 AM
7/9/2015 5:00:00 AM
ReceivedDate
7/9/2015 12:00:00 AM
So, the first time it was updated there was no value but it was replaced with July 8, 2015 and so on.This is what the report is displaying
This is the query:
CASE UpdateColumn
... WHEN 'ReceivedDate' THEN (replace(convert(varchar(11),CONVERT ( date, oldvalue ), 106), ' ', '-') )
...
I tried adding
CASE UpdateColumn
...
WHEN 'ReceivedDate' IS NOT NULL
THEN (replace(convert(varchar(11),CONVERT ( date, oldvalue ), 106), ' ', '-') )
...
But it did not like the "IS NOT NULL".
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Apr 26, 2015
Simple table created but unable to insert values into it due to the above error
CREATE TABLE Ingredient(
ingredientCode CHAR(10)
PRIMARY KEY NOT NULL,
name VARCHAR(20),
ingreType VARCHAR(20),
[Code] .....
--always received this error: Conversion failed when converting date and/or time from character string
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Sep 11, 2015
below is some code I use to identify where a patient has attended the ED department whilst also admitted as an Inpatient. This report works fine. However while most of the results are recording issues to be corrected some of them are real and as so can be excluded from the report.
Is there a way I can build in an exclusion table which would include:
SELECT
IP_ADMISSION.HeyNo AS HEYNo
,IP_ADMISSION.NHSNo2 AS NHSNo
,IP_ADMISSION.Forename AS Forename
,IP_ADMISSION.Surname AS Surname
,IP_ADMISSION.SourceAdmNatCode AS SourceAdm
[code]....
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Apr 24, 2015
I am writing an Instead of Insert trigger. I would like to fire an error when inserting into an 'Identity' column. Since UPDATE([ColumnName]) always returns TRUE for insert statements, is there an easy/fast way around this? I don't want to use:
IF(EXISTS(SELECT [i].[AS_ID] FROM [inserted] [i] WHERE [i].[AS_ID] IS NULL))
here is my pseudo-code...
CREATE VIEW [org].[Assets]
WITH SCHEMABINDING
[Code] .....
-- How does this statement need to be written to throw the error?
--UPDATE([AS_ID]) always returns TRUE
IF(UPDATE([AS_ID]))
RAISERROR('INSERT into the anchor identity column ''AS_ID'' is not allowed.', 16, 1) WITH NOWAIT;
-- Is there a faster/better method than this?
IF(EXISTS(SELECT [i].[AS_ID] FROM [inserted] [i] WHERE [i].[AS_ID] IS NOT NULL))
RAISERROR('INSERT into the anchor identity column ''AS_ID'' is not allowed.', 16, 1) WITH NOWAIT;
-- Do Stuff
END;
-- Should error for inserting into [AS_ID] field (which is an identity field)
INSERT INTO [org].[Assets]([AS_ID], [Tag], [Name])
VALUES(1, 'f451', 'Paper burns'),
(2, 'k505.928', 'Paper burns in Chemistry');
-- No error should occur
INSERT INTO [org].[Assets]([Tag], [Name])
VALUES('f451', 'Paper burns'),
('k505.928', 'Paper burns in Chemistry');
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May 27, 2015
Is there a simple command that can be executed to check if the current user has sysadmin privs? I just want to check to see if I have sysadmin privs and if so then execute a command, if not do nothing in .Net code. I just want to do this check once and set a variable in the .net code.
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Oct 6, 2015
I am trying to create a check constraint that prevents entry of a date range that overlaps any other date range in the table. The below example script results in the error message: The INSERT statement conflicted with the CHECK constraint "ck_dt_overlap". what I am doing wrong?
CREATE TABLE t1 (d1 date,d2 date)
go
create function dbo.dt_overlap (@d1 date, @d2 date) RETURNS BIT
AS
BEGIN
IF EXISTS (SELECT 1 from t1 where d1 between @d1 and @d2 or d2 between @d1 and @d2)
RETURN 1
RETURN 0
END
go
alter table t1 add constraint ck_dt_overlap CHECK (dbo.dt_overlap(d1,d2)=0)
go
insert into t1 values ('2015-01-01','2015-02-01')
insert into t1 values ('2015-01-15','2015-02-15')
--BOTH inserts result in the following message: The INSERT statement conflicted with the CHECK constraint "ck_dt_overlap".
drop table t1
drop function dbo.dt_overlap
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Jun 11, 2015
CREATE TABLE PRODUCT_SALES
(
Salesmanid BIGINT,
Productid BIGINT
)
INSERT INTO PRODUCT_SALES (Salesmanid,Productid) VALUES (1,1)
INSERT INTO PRODUCT_SALES (Salesmanid,Productid) VALUES (1,2)
INSERT INTO PRODUCT_SALES (Salesmanid,Productid) VALUES (1,3)
SELECT * FROM PRODUCT_SALES
/* SalesmanID is reference key from Sales Master and ProductID is reference key from Product Master. How should i restrict user through DB with any constraint check, if user tries to enter
INSERT INTO PRODUCT_SALES (Salesmanid,Productid) VALUES (1,2),
It should throw error , if possible user defined message would be more useful.
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