Transact SQL :: Replacing Isnull With Previous Value
May 25, 2015
I am having table like below,
Period Pointvaluemonth area
NULLNULLNULLApril tn
NULLNULLNULLMaytn
NULLNULLNULLJunetn
NULLNULLNULLJulytn
NULLNULLNULLAugusttn
201109 100 10Septembertn
[Code] ....
Then i want to copy september value for october and november and Jan value for feb & mar like next null values should get replaced with previous not null value ...
My desired output is ,
Expected Output is…..
Period Pointvaluemonth area
NULLNULLNULLApril tn
NULLNULLNULLMay tn
NULLNULLNULLJune tn
NULLNULLNULLJuly tn
NULLNULLNULLAugust tn
201109 100 10September tn
[Code] ....
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Jul 10, 2015
I am in assumption that we cannot do NULL value comparison in where clause directly (results will not be proper) we have to use ISNULL. Is my understanding correct? Is using ISNULL efficient when we have to this operation for large volume?
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May 13, 2015
How to replace this Case When
SELECT CASE WHEN Col_1 IS NULL THEN -1 ELSE Col_2 END AS C
FROM MyTable
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Oct 27, 2015
I have a field called PPH and this field type float. so, this field could be null, 0.0, or values. I am using case statement:
[PPH] = case when h.HoursFloat = 0 then 0 else
round(s.Pledges / h.HoursFloat,2) end,
I am trying to add where if h.HourFloat is null then 0 but, it does not work. I have tried different ways such as
[PPH] = CASE isnull (h.HoursFloat,0)
when 0 then 0 else ....
How to add another condition to check on null then 0.
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Oct 30, 2015
I'm struggeling a bit with this one, goal is to show the first 3 characters of the name and replace the remaining characters with *** stars. Also the number of stars needs to match the lenght of the name as in the example above.I've tried:
REPLACE([ColName],
substring([Colname],
4,
LEN([colname]
)),
'*')
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Oct 6, 2015
When we are getting data in a table and we want to replace characters with other characters. For example, We have a table with a street address, and there are numerous ascii character values we want to review and replace if they exist. We were looking at using a table with 2 columns, 1 containing each ascii character value the other it's preferred replacement value. Then updating the street address searching through each ascii character and replacing it if needed. Currently, we are running it through a looping process searching each individual address for each ascii character, and updating it.
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Dec 10, 2010
How to get First day of previous month and last day of previous month(From getdate()) using SQL..?
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Aug 10, 2015
I have a table with data like below
SampleDateTime Value
2015-08-08 01:00 AM 0.5
2015-08-08 02:00 AM Null
2015-08-08 03:00 AM Null
2015-08-08 04:00 AM Null
[code]....
Using subquery I thought of a couple of ways but that didn't work.
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Sep 22, 2015
I have one table :
file _target
which has below records..
file_target_ID is identity column which will repeat per files_ID
Now, i just shown Target log for file_ID 77796 see the last Target Date i want another column which returns a previous log Target date for each files beside Target date column
Like this ..
Target Date New Column
2015-09-09 00:00:00.000 2015-09-16 00:00:00.000
2015-09-16 00:00:00.000 2015-09-25 00:00:00.000
2015-09-25 00:00:00.000 New Target date after 25-9-2015
how to do this in SQL Server ??
using Cross Apply ?? Row_Number() ??
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Oct 9, 2015
How I can setup the first of November of the previous year dynamically? So running now it should be 01-11-2014 but if I run in 2th of January 2016 it should be 01-11-2015.
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Sep 25, 2015
I need to return the previous row value if it is negative in current row. For example, in the below table for ID=7 i need the value 1305(ID=4) since 6,5 are negative values.
Existing
values
ID
Input
ID
Input
[code]...
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Jul 25, 2015
Below is the resultset I got using the following SQL statement
SELECT ROW_NUMBER() OVER (PARTITION BY ID ORDER BY create_date DESC) AS RowNum
,ID
,create_date
,NULL AS end_date
FROM dbo.Table_1
Resultset:
RowNum ID
create_date end_date
1 0001
2015-02-18 NULL
2 0001
2014-04-28 NULL
[Code] ....
Now, I want to update the end_date column with the create_date's values for the next row_number. Desired output is shown below:
RowNum ID
create_date end_date
1 0001
2015-02-18 NULL
2 0001
2014-04-28 2015-02-18
[Code] ....
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Oct 29, 2015
I am trying to pick up the customers invoiced twice or more within a month. In the case below Pepsi Cola and Jack Daniel were invoiced twice in October. The query need to pickup the previous month, se being in October I need to pick up the invoice of September.
create table #forum (Customer varchar(20),Invoiced date)
insert into #forum values ('Pepsi Cola','2015-09-01') ,('Pepsi Cola','2015-09-06') ,
('Pepsi Cola','2015-10-01') ,('Pepsi Cola','2015-10-02') ,('Pepsi Cola','2015-11-01') ,
('Ferrarelle','2015-09-01') ,('Ferrarelle','2015-10-01') ,('Ferrarelle','2015-11-16') ,('Ferrarelle','2015-11-01') ,
('Jack Daniel','2015-09-01') ,('Jack Daniel','2015-09-04') ,('Jack Daniel','2015-09-06') ,('Jack Daniel','2015-09-30') ,
('Jack Daniel','2015-10-01') ,('Jack Daniel','2015-10-18') ,('Jack Daniel','2015-11-01') ,
('Bud','2015-09-01') ,('Bud','2015-10-01') ,('Bud','2015-11-01')
select * from #forum
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Aug 21, 2015
I have a scenario to compare previous records based on each ID columns. For each ID, there would be few records, I have a column called "compare", We have to compare all Compare 1 records with Compare 0 Records. If Dt is lesser or equal to comparing DT, then show 0. Else 1
We always only one Compare 0 records in my table, so all compare 1 columns will compare with only one row per ID
My tables look like
Declare @tab1 table (ID Varchar(3), Dt Date, Compare Int)
Insert Into @tab1 values ('101','2015-07-01',0)
Insert Into @tab1 values ('101','2015-07-02',1)
Insert Into @tab1 values ('101','2015-07-03',1)
Insert Into @tab1 values ('101','2015-07-01',1)
Insert Into @tab1 values ('101','2015-06-30',1)
Insert Into @tab1 values ('102','2015-07-01',0)
Insert Into @tab1 values ('102','2015-07-02',1)
Insert Into @tab1 values ('102','2015-07-01',1)
select * from @tab1
1.) In the above scenario for ID = '101', we have 5 records, first record has Compare value 0, which mean all other 4 records need to compare with this record only
2.) If Compare 1 record's Dt is less or equal to Compare 0's DT, then show 0 in next column
3.) If Compare 1 record's Dt is greater than Compare 0's DT, then show 1 in next column
My expected result set should be like ....
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May 28, 2015
I have simple query that works fine if I write it every time. I want to get this one time group by each year and week ending. here us the query:
Select count(distinct ID) from table1 where year<=2015 and WeekEnding<='05/09'
Select count(distinct ID) from table1 where year<=2015 and WeekEnding<='05/16'
Select count(distinct ID) from table1 where year<=2015 and WeekEnding<='05/23'
How can I get the count for each week year and each week ending? Weekending 05/16 will include ID's from weekending 05/09 as well and week ending 05/23 will include all the ID's from 05/16 and 05/09 and so on...
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Nov 18, 2015
There are two tables testmaster and testdetail. If the value of Price for a particular ID in testdetail is more than the threshold value defined in testmaster, the output should have a new column with value as 'High Value', if the value is less than the threshold the new output should be 'Low Value' other wise 'Ignore'
Example: for ID=3, threshold is defined as 40% in testmaster table, but on 11/12/2015 the new price is 100 which 100% more than the previous value, so the status is High Value as shown below.
ID Date
Price Status
1 11/12/2015 100 Low Value
2 11/12/2015 160 Ignore
3 11/12/2015 100 High Value
create table testmaster
(
ID int,
Threshold int
)
create table testdetail
(
ID int,
Date varchar(20),
Price float
)
[Code] ...
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Jun 16, 2015
I am looking to pull all records for current & previous calendar year in one query. I know how to pull the current calendar year, but how would I pull current & previous?
select id, list_date
from tableA
where list_date > DATEADD(year,-1,GETDATE())
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Aug 7, 2015
I have a table with 1 million records. I want to update only 400 records. The update statement is provided by a 3rd party vendor. Once i run the update statement it will update all the 400 records. Once the table is updated the users will validate the table
if the update is successful or not. What i'm looking for is:
1) Is there a way to identify what records were updated.
2) If the update done is not what the users wanted i need to undo and bring back the 400 records to their previous values.
I'm on sql server 2008.
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Nov 16, 2015
is it possible to use the window functions to count the number of rows in the previous 24hours from the current row.
I have a table of events like:
User, TimeStamp, etc...
I want to identify the row which is the event number 50 in the past 24 hours.
does the window functions can do this? and how?
the ROW PRECEDING etc... appear to not have enough feature to support time related function.
Stream-insight is able to create this type of query, but I have to do it directly in SQL.
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Sep 10, 2013
Need getting a query which I will get previous year, previous month first day everytime i run the query.
Ex: If i run the script on 9/10/2013 then result should be 8/1/2012. (MM/DD/YYYY)
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Aug 22, 2000
I am trying to delete a row of data that is all nulls. Help in BOL was a little help but it is not working.
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Apr 30, 2008
I create a stored procedure like such:
"create procedure tmptable_query (@lname varchar(20)) as select * from #temp_table where lname like ISNULL(@lname+'%',lname)"
Unfortunately, it only returns exact matches, as if it were written as "where lname = ISNULL(@lname, lname)"
However, if I query from a static table the code works correctly.Any ideas on what could be wrong?
Thank you.
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Feb 28, 2008
for the query i created i need zeros where ever the filed is blank. i have used count(acc) for selecting the count . can any one help me out with sample query. Thanks in advance
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Jul 20, 2005
I have two tables, tblMTO and tblIMPORT_MTO. If I import an entire MTOinto the import table I want to create a delta from it (i.e. leave onlythe changed items). I have a view (simplified)SELECT dbo.tblIMPORT_MTO.ImportID, dbo.tblIMPORT_MTO.MTONo,dbo.tblIMPORT_MTO.Rev AS New_Rev, dbo.tblMTO.Rev AS Old_RevFROM dbo.tblIMPORT_MTO LEFT OUTER JOINdbo.tblMTO ON dbo.tblIMPORT_MTO.MTONo = dbo.tblMTO.MTONoNow to get all rows where old_rev = new_rev I also want all rows whereboth are null, is the best method to put ISNULL() in the view or toselect from the view using ISNULL in the criteria, e.g.select * from view1 where ISNULL(Old_Rev,0)=ISNULL(new_rev,0)or in the viewCREATE VIEW view1 asSELECT dbo.tblIMPORT_MTO.ImportID, dbo.tblIMPORT_MTO.MTONo,ISNULL(dbo.tblIMPORT_MTO.Rev,0) AS New_Rev, ISNULL(dbo.tblMTO.Rev ASOld_Rev,0)FROM dbo.tblIMPORT_MTO LEFT OUTER JOINdbo.tblMTO ON dbo.tblIMPORT_MTO.MTONo = dbo.tblMTO.MTONo;select * from view1 where Old_Rev=new_rev;
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Apr 24, 2006
does sql server mobile 2005 support the isnull function? I'm getting an error when I try to use it and I don't know if it is becuase of using the isnull function or not, but when I run the same query on Sql Server 2005 it works fine.
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Apr 29, 2008
I've seen lots of entries recommending the use of ISNULL in SQL WHERE clauses, e.g. in a search sproc where users can enter some or all parameters to search a table. Previously I would have used something like:SELECT * FROM MyTableWHERE (FName = @fname OR @fname IS NULL) AND(MName = @mname OR @mname IS NULL) AND(LName = @lname OR @lname IS NULL)So using the neat ISNULL syntax it could be updated to:SELECT * FROM MyTableWHERE (FName = ISNULL(@fname, FName)) AND(MName = ISNULL(@mname, MName)) AND(LName = ISNULL(@lname, LName))Having played around with this I stumbled upon a problem. If one of the fields, e.g. MName, is NULL then that clause will return false since MName = NULL isn't true and you have to use MName IS NULL. Did I miss all the caveats with using ISNULL in this way on fields that can contain NULL or have I missed something else?
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May 1, 2008
I've got this query and it use to work or at least I thought it did. Could someone please help me with it.
Thank you
SELECT CID, CompletionDate, MarkedExport, CustomerName, EditUser, RouteID, WorkOrder FROM RouteCustomer WHERE (CompletionDate IS NOT NULL) AND (ExportDate IS NULL) AND (RouteID LIKE '%' + ISNULL(RouteID,@RouteID) + '%') AND (EditUser IS NULL OR EditUser = '' OR EditUser = @EmployeeID) AND (MONTH(CompletionDate) = ISNULL(MONTH(CompletionDate),@Month))
The problem comes with in the WHERE clause. What I wanted it to do is if the user did want to use a RouteID critera then the user would speified one else it wouldn't, and it was my belief that the ISNULL feature in SQL was the answer for that. same for the Month. I believe the EditUser is fine the way it is written.
thanks to anyone that can help me with this.
Rex
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Jun 7, 2005
I have to display string "not assigined" when a datefield is null in a table.
I am using like ISNULL(datefiled, "not assigned"), but I am getting following error
Syntax error converting character string to smalldatetime data type.
Is there any way, I can acheive desired result.
Please help
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Feb 1, 2015
To give you a little background, there is a CRM system with SQL server as its back-end. The CRM uses a view in SQL Server to list all the communications a user has had with his client over any given interval of time. Now there is a requirement to add a new column in the view that tells a user if the communication was filed in automatically or if it happened overnight via an automated archive manager process. I have achieved this using an expression field which is based on the comm_url field in the communications table in database.
example:
create view vCommunications
as
select col1, col2,...,case when comm_url is null then 'Manually filed' else 'Automatically Filed' as Filing
from Communications
alternatively, this can also be achieved by the following:
create view vCommunications
as
select col1, col2,...,isnull(comm_url, 'Manually Filed') as Filing
from Communications
Now my question is, given that there are many rows in the communications table, which of the above two expression fields will be more efficient in performance i.e. CASE versus ISNULL. I've checked a lot on google but I haven't been able to come up with a concrete answer.
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Apr 9, 2008
Hi All,
Quick question...
why doesn't this work....
select IsNULL(select null),'TallOne')
But this does...
select IsNull((Select null),0)
How does it know what datatype I'm trying to get?
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Apr 18, 2008
Hey, I'm taking an intro SQL Server class, and I have a pretty simple homework assignment. We were provided with a DB and asked to write several SELECT statements. However, I'm stuck up one of the questions. Here is the question: 12.Create a SELECT statement that displays all employees and their Qualifications. Display that individuals with no Qualifications as having ‘NoQual’. Hint: Use a function to determine this ‘empty’ field using ISNULL.
Here is what I have:
SELECT
FNAME + ' ' + LNAME AS 'Employee Name', ISNULL(QUALID, 'NoQual') AS 'Qualifications'
FROM
EMPLOYEE, QUALIFICATION
WHERE
EMPLOYEE.QUALID = QUALIFICATION.QUALID;
However, I do not get any results that have a NULL value in the QUALID column. Here is the code for the DB:
CREATE TABLE emplevel
(LevelNoint,
LowSalaryint,
HighSalaryint,
CONSTRAINT emplevel_levelno_pk PRIMARY KEY (LevelNo));
GO
CREATE TABLE position
(PositionIdint,
PosDescVARCHAR (10),
CONSTRAINT position_positionid_pk PRIMARY KEY (PositionId));
GO
CREATE TABLE qualification
(QualIdint,
QualDescVARCHAR (11),
CONSTRAINT qualification_qualid_pk PRIMARY KEY (QualId)
);
GO
CREATE TABLE dept
(DeptIdint,
DeptNameVARCHAR (12) ,
LocationVARCHAR (15),
EmployeeIdint,
CONSTRAINT dept_deptid_pk PRIMARY KEY (DeptId)
);
GO
CREATE TABLE employee
(EmployeeId int,
LnameVARCHAR (15) CONSTRAINT employee_lname_nn NOT NULL,
Fname VARCHAR (15) CONSTRAINT employee_fname_nn NOT NULL,
PositionId int,
Supervisorint,
HireDate DATETIME,
Salaryint,
Commissionint,
DeptIdint,
QualIdint,
CONSTRAINT employee_employeeid_pk
PRIMARY KEY (EmployeeId)
);
GO
CREATE TABLE dependent
(EmployeeId int,
DependentIdint,
DepDOBDATETIME,
RelationVARCHAR (8),
CONSTRAINT dependent_empiddepid_pk PRIMARY KEY (EmployeeId, DependentId)
);
GO
INSERT INTO position VALUES (1, 'President');
INSERT INTO position VALUES (2, 'Manager');
INSERT INTO position VALUES (3, 'Programmer');
INSERT INTO position VALUES (4, 'Accountant');
INSERT INTO position VALUES (5, 'Salesman');
INSERT INTO emplevel VALUES (1, 1, 25000);
INSERT INTO emplevel VALUES (2, 25001, 50000);
INSERT INTO emplevel VALUES (3, 50001, 100000);
INSERT INTO emplevel VALUES (4, 100001, 500000);
INSERT INTO qualification VALUES (1, 'Doctorate');
INSERT INTO qualification VALUES (2, 'Masters');
INSERT INTO qualification VALUES (3, 'Bachelors');
INSERT INTO qualification VALUES (4, 'Associates');
INSERT INTO qualification VALUES (5, 'High School');
INSERT INTO dept VALUES (10, 'Finance', 'Charlotte', 123);
INSERT INTO dept VALUES (20, 'InfoSys', 'New York', 543);
INSERT INTO dept VALUES (30, 'Sales', 'Woodbridge', 135);
INSERT INTO dept VALUES (40, 'Marketing', 'Los Angeles', 246);
INSERT INTO employee VALUES (111, 'Smith', 'John', 1, NULL,'04/15/1960', 265000, 35000, 10, 1);
INSERT INTO employee VALUES (246, 'Houston', 'Larry', 2, 111,'05/19/1967', 150000, 10000, 40, 2);
INSERT INTO employee VALUES (123, 'Roberts', 'Sandi', 2, 111,'12/02/1991',75000, NULL, 10, 2);
INSERT INTO employee VALUES (433, 'McCall', 'Alex', 3, 543,'05/10/1997',66500, NULL, 20, 4);
INSERT INTO employee VALUES (543, 'Dev', 'Derek', 2, 111,'03/15/1995',80000, 20000, 20, 1);
INSERT INTO employee VALUES (200, 'Shaw', 'Jinku', 5, 135,'01/03/00',24500, 3000, 30, NULL);
INSERT INTO employee VALUES (135, 'Garner', 'Stanley', 2, 111,'02/29/1996',45000, 5000, 30, 5);
INSERT INTO employee VALUES (222, 'Chen', 'Sunny', 4, 123,'08/15/1999',35000, NULL, 10, 3);
INSERT INTO dependent VALUES (543, 1,'09/28/1958','Spouse');
INSERT INTO dependent VALUES (543, 2,'10/14/1988','Son');
INSERT INTO dependent VALUES (200, 1,'06/10/1976','Spouse');
INSERT INTO dependent VALUES (222, 1,'02/04/1975','Spouse');
INSERT INTO dependent VALUES (222, 2,'08/23/1997','Son');
INSERT INTO dependent VALUES (222, 3,'07/10/1999','Daughter');
INSERT INTO dependent VALUES (111, 1,'12/12/1945','Spouse');
ALTER TABLE dept
ADD CONSTRAINT dept_employeeid_fk FOREIGN KEY(EmployeeId)
REFERENCES employee(EmployeeId);
GO
--ALTER TABLE employee
--ADD CONSTRAINT employee_supervisor_fk FOREIGN KEY(Supervisor)
--REFERENCES employee(EmployeeId);
ALTER TABLE employee ADD CONSTRAINT employee_positionid_fk FOREIGN KEY (PositionId)
REFERENCES position (PositionId);
GO
ALTER TABLE employee ADD CONSTRAINT employee_deptid_fk FOREIGN KEY (DeptId)
REFERENCES dept (DeptId);
GO
ALTER TABLE employee ADD CONSTRAINT employee_qualid_fk FOREIGN KEY (QualId)
REFERENCES qualification (QualId);
GO
ALTER TABLE dependent ADD CONSTRAINT dependent_employeeid_fk FOREIGN KEY (EmployeeId)
REFERENCES employee (EmployeeId);
GO
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Jun 17, 2008
I'm having a problem creating a isnull statement.
I want to do two things I want to list all of the accounts that have a null value in a numeric field. And I want to update those accounts to 0.00.
I tried:
select Account_Num, isnull(TotalDDMFEE, 0)
FROM Addr_20080402
But it returned all records
For the update I tried:
update Addr_20080402
CASE
when TotalDDMFEE = ' ' then TotalDDMFEE = 0.00
AND
update Addr_20080402
CASE
when TotalDDMFEE = isnull(TotalDDMFEE, 0) then TotalDDMFEE = 0.00
Any ideas how I should have written these two queries?
Thanx,
Trudye
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Dec 29, 2006
okay, using isnull function we could replace null value..
but i want to do opposite, i want to replace if it's NOT null..
i tried notisnull also cannot..
Note : this is for select statement
SELECT isnull(d.ClientID,'-') FROM blabla
How to replace something if it's not null
SELECT isNOTnull(d.ClientID, '-')
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