SQL: Sequential Random Select

Mar 8, 2006

Hello--I need to create a SQl statement (SQL SERVER 2000) which will do the following:

read table1 sequentially
select every "nth" record
write each selected record to and output table

Your help is greatly appreciated.
thanks,
MB

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SQL Server Admin 2014 :: How To Test Random / Sequential Ratio

Aug 31, 2015

I am checking some ratio numbers for our system engineers, those are

Read/write ratio?
Random/sequential ratio?
Read/write block size?

For Read/write ratio, I am using below query,

SELECT
m.type_desc
, CEILING(sum(num_of_bytes_read*1.0) / (sum(num_of_bytes_read*1.0) + sum(num_of_bytes_written*1.0)) * 100) AS 'Read %'
, CAST((sum(v.size_on_disk_bytes) / 1024.0 / 1024 / 1024) AS MONEY) AS 'FileSizeGB'

[Code] ....

Random/sequential ratio, I googled but cannot find a similar query to get the result?

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I have a problem. In my database I have the following numbers available:

101
104
105
110
111
112
113
114

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101 0
104 1 (the number 105)
105 0
110 4 (the numbers 111,112,113,114)
111 3 (the numbers 112,113,114)
112 2 (the numbers 113,114)
113 1 (the numbers 114)
114 0

How can I do It?

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item_no seq_no note doc_no
ABC 1 blah 1
ABC 2 blahh 1
ABC 3 bla3 1
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Label9.Visible = false;if (!IsPostBack)
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Label1.Text = re[0].ToString();
Label2.Text = re[1].ToString();
Label3.Text = re[2].ToString();
Label4.Text = re[3].ToString();
Label5.Text = re[4].ToString();
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{
Panel1.Visible = true;Panel2.Visible = false;
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else
{Panel1.Visible = false;Panel2.Visible = true;
}
}
re.Close();
}
}
 
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{string Answer = "";if (RadioButton1.Checked == true)
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}else if (RadioButton2.Checked == true)
{Answer = "B";
}else if (RadioButton3.Checked == true)
{Answer = "C";
}else if (RadioButton4.Checked == true)
{Answer = "D";
}else if (RadioButton5.Checked == true)
{Answer = "True";
}else if (RadioButton6.Checked == true)
{Answer = "False";
}SqlConnection con1 = new SqlConnection(@"server=123-9181FF31362SQLEXPRESS;user id=sampleu;pwd=Sampleu2;database=n;");
con1.Open();
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SqlDataReader re1;string result1 = "";
re1 = cmd1.ExecuteReader();if (re1.Read())
{
result1 = re1[0].ToString();
}
//Session["ans"] = 0;if (Answer == result1)
{Session["ans"] = (Convert.ToInt16(Session["ans"].ToString()) + 1);
 
}
con1.Close();
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RadioButton1.Checked = false;RadioButton2.Checked = false;
RadioButton3.Checked = false;RadioButton4.Checked = false;
RadioButton5.Checked = false;RadioButton6.Checked = false;
 
 SqlConnection con = new SqlConnection(@"server=123-9181FF31362SQLEXPRESS;user id=sampleu;pwd=Sampleu2;database=n;");
con.Open();SqlCommand cmd = new SqlCommand("select * from n3 where sno='" + Convert.ToInt16(Session["id"].ToString()) + "' ", con);SqlDataReader re;
re = cmd.ExecuteReader();
 
 
 while (re.Read())
{
Label1.Text = re[0].ToString();
Label2.Text = re[1].ToString();
Label3.Text = re[2].ToString();
Label4.Text = re[3].ToString();
Label5.Text = re[4].ToString();
Label6.Text = re[5].ToString();string sss = re[6].ToString();if (sss == "nil")
{
Panel1.Visible = true;Panel2.Visible = false;
}
else
{Panel1.Visible = false;Panel2.Visible = true;
}
}
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{
Label10.Text = Session["ans"].ToString() + " / " + "10";Label9.Visible = true;
Label10.Visible = true;
//int x = Convert.ToInt16(Session["ans"].ToString());
//int y = (x/10) * 100;//y = Label10.Text;
 
}
////// SqlConnection con6 = new SqlConnection(@"server=123-9181FF31362SQLEXPRESS;user id=sampleu;pwd=Sampleu2;database=n;");
////// con6.Open();
////// SqlCommand cmd6 = new SqlCommand("SELECT CONVERT(int, 10*RAND()) from n3 where sno='" + Convert.ToInt16(Session["id"].ToString()) + "' ", con6);
////// SqlDataReader re6;
////// re6 = cmd6.ExecuteReader();
////// //select top 5 * from Employee order by NEWID()
//////// SELECT FirstName,LastName
////////FROM Person.Contact
////////TABLESAMPLE SYSTEM (10 PERCENT)
 
////// while (re6.Read())
////// {
////// Label1.Text = re6[0].ToString();
////// }
////// con6.Close();
}
}

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SET NOCOUNT ON


Declare @RandomRecordCount as int, @Counter as int
Select @RandomRecordCount = 1000

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Declare @Source table (Name nvarchar(200) NOT NULL)
Declare @Users table (Name nvarchar(200) NOT NULL)
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while @Counter < @RandomRecordCount
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Select 'Type: Cadillac' UNION ALL
Select 'Type: Chevrolet' UNION ALL
Select 'Type: GMC'

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Select 'Source: Japan' UNION ALL
Select 'Source: China' UNION ALL
Select 'Source: Spain' UNION ALL
Select 'Source: India' UNION ALL
Select 'Source: USA'

Insert into @Users(Name)
Select 'keith' UNION ALL
Select 'kevin' UNION ALL
Select 'chris' UNION ALL
Select 'chad' UNION ALL
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select
1 ProviderId, -- static value
'' Identifier,
'' ClassificationCode,
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Updated Data
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