Handy T-SQL Commands

_T-SQL Syntax Samples.md

T-SQL Syntax Samples

Add random number to INSERT statement.sql

/*
If you want to add a column with random numbers as part of an INSERT statement, you can't use the RAND() function becuase you will always get the same number.
Instead, use the  following code, which will return a random number between 0 and one less than the number following the modulus operator
*/

SELECT ABS(CHECKSUM(NewId())) % 6 -- this will return a random number between 0 and 5

SELECT (ABS(CHECKSUM(NewId())) % 5) + 1 -- this will return a random number between 1 and 5

collation error.sql

/*
Problems with collation affect equality
ERROR: Cannot resolve the collation conflict between "SQL_Latin1_General_CP1_CI_AS" and "Latin1_General_CI_AS" in the equal to operation.


Reference: https://stackoverflow.com/questions/1404880/sql-collation-conflict-when-comparing-to-a-column-in-a-temp-table
*/


SELECT  *
FROM    my_table
INNER JOIN
        @TempTable tem
ON      my_table.id = temp.id COLLATE SQL_Latin1_General_CP1_CI_AS
        AND my_table.key = 'SOME STRING'
        
-- OR

CREATE TABLE @TempTable (ID NVARCHAR(255) COLLATE database_default)

column name list.sql

select *
from INFORMATION_SCHEMA.COLUMNS
where TABLE_NAME='YourTableName'

Convert Date and Seconds from Midnight to DateTime.sql

/*This converts {DateFiel} and {TimeField} to a DateTme format*/
SELECT (DATEADD(s, {TimeField}, CAST({DateField} AS DateTime))) AS Timestamp, * FROM MyTable

Count Occurances of a Value.sql

/* Count how many times a value is repeated in a table */

SELECT  Key1, 
        COUNT(Key1) AS Total, 
        (SELECT COUNT(*) FROM MyTable) AS Records, 
        (COUNT(Key1) * 1.0 / (SELECT COUNT(*) FROM MyTable) * 1.0) AS Pct
FROM    MyTable 
GROUP   BY Key1
ORDER BY (COUNT(Key1) * 1.0 / (SELECT COUNT(*) FROM MyTable) * 1.0) DESC

Data Conversions.sql

--Convert a date and a time into a datetime:
--where @SysTime and @Date are the db fields you want to convert
CAST(DATEADD(ms, @SysTime * 1000, 0) AS datetime) + CAST(@Date AS datetime)

Find row counts for all tables in a database.sql

--https://stackoverflow.com/a/32980415
select t.name, s.row_count
from sys.tables t
join sys.dm_db_partition_stats s
  ON t.object_id = s.object_id
    and t.type_desc = 'USER_TABLE'
    and t.name not like '%dss%'
    and s.index_id = 1

Get file locations for all databases.sql

SELECT
    db.name AS DBName,
    type_desc AS FileType,
    Physical_Name AS Location
FROM
    sys.master_files mf
INNER JOIN 
    sys.databases db ON db.database_id = mf.database_id

Identify long-running queries.sql

DECLARE @sp_who2 table
(
      [SPID] varchar(20),
      [Status] varchar(50),
      [Login] varchar(100),
      [HostName] varchar(100),
      [BlockedBy] varchar(20),
      [DBName] varchar(50),
      [Command] varchar (100),
      [CPUTime] varchar(25),
      [DiskIO] varchar(25),
      [LastBatch] varchar(20),
      [ProgramName] varchar(100),
      [SPID2] varchar(20),
      [REQUESTID] varchar(20)
      
)

INSERT INTO @sp_who2
exec sp_who2

SELECT GETDATE()as RunDateTime, * from @sp_who2
WHERE RTRIM([Status]) in ('RUNNABLE', 'SUSPENDED')

Pausing a High Availability Node.md

Sort a varchar field that contains numeric values.sql

SELECT
  CASE	
		WHEN ISNUMERIC(varchar_field)=1 
			THEN str(CAST(varchar_field AS float),30,30)
		ELSE varchar_field
	END AS numeric_sorted_varchar_field


--EXAMPLE
-- Not fully functional...problems with float conversion precision
DECLARE @is TABLE(
	val varchar(30)
)
INSERT INTO @is
(val)
VALUES
('0.00'), ('0'), ('0.00'), ('0.10'), ('0.15'), ('0.2'), ('1'), ('1.0'), ('1.1'), ('1.15'), ('1.2'), ('1.20'), ('15.0'), ('15'), ('15.1123'), ('20'), ('21.0'), ('22.351'), ('3'), ('30.12'),(''),('low'),('high'),('1132262.1')


SELECT 
	CAST(
	CASE	
		WHEN ISNUMERIC(val)=1 
			THEN STR(CAST(val AS float), 30,30)
		ELSE val
	END AS VARCHAR(30)) AS i
FROM @is
ORDER BY i

Transfer logins from one server to another.sql

/*
Read: https://support.microsoft.com/en-us/help/918992/how-to-transfer-logins-and-passwords-between-instances-of-sql-server
*/
USE master
GO
IF OBJECT_ID ('sp_hexadecimal') IS NOT NULL
  DROP PROCEDURE sp_hexadecimal
GO
CREATE PROCEDURE sp_hexadecimal
    @binvalue varbinary(256),
    @hexvalue varchar (514) OUTPUT
AS
DECLARE @charvalue varchar (514)
DECLARE @i int
DECLARE @length int
DECLARE @hexstring char(16)
SELECT @charvalue = '0x'
SELECT @i = 1
SELECT @length = DATALENGTH (@binvalue)
SELECT @hexstring = '0123456789ABCDEF'
WHILE (@i <= @length)
BEGIN
  DECLARE @tempint int
  DECLARE @firstint int
  DECLARE @secondint int
  SELECT @tempint = CONVERT(int, SUBSTRING(@binvalue,@i,1))
  SELECT @firstint = FLOOR(@tempint/16)
  SELECT @secondint = @tempint - (@firstint*16)
  SELECT @charvalue = @charvalue +
    SUBSTRING(@hexstring, @firstint+1, 1) +
    SUBSTRING(@hexstring, @secondint+1, 1)
  SELECT @i = @i + 1
END

SELECT @hexvalue = @charvalue
GO
 
IF OBJECT_ID ('sp_help_revlogin') IS NOT NULL
  DROP PROCEDURE sp_help_revlogin
GO
CREATE PROCEDURE sp_help_revlogin @login_name sysname = NULL AS
DECLARE @name sysname
DECLARE @type varchar (1)
DECLARE @hasaccess int
DECLARE @denylogin int
DECLARE @is_disabled int
DECLARE @PWD_varbinary  varbinary (256)
DECLARE @PWD_string  varchar (514)
DECLARE @SID_varbinary varbinary (85)
DECLARE @SID_string varchar (514)
DECLARE @tmpstr  varchar (1024)
DECLARE @is_policy_checked varchar (3)
DECLARE @is_expiration_checked varchar (3)

DECLARE @defaultdb sysname
 
IF (@login_name IS NULL)
  DECLARE login_curs CURSOR FOR

      SELECT p.sid, p.name, p.type, p.is_disabled, p.default_database_name, l.hasaccess, l.denylogin FROM 
sys.server_principals p LEFT JOIN sys.syslogins l
      ON ( l.name = p.name ) WHERE p.type IN ( 'S', 'G', 'U' ) AND p.name <> 'sa'
ELSE
  DECLARE login_curs CURSOR FOR


      SELECT p.sid, p.name, p.type, p.is_disabled, p.default_database_name, l.hasaccess, l.denylogin FROM 
sys.server_principals p LEFT JOIN sys.syslogins l
      ON ( l.name = p.name ) WHERE p.type IN ( 'S', 'G', 'U' ) AND p.name = @login_name
OPEN login_curs

FETCH NEXT FROM login_curs INTO @SID_varbinary, @name, @type, @is_disabled, @defaultdb, @hasaccess, @denylogin
IF (@@fetch_status = -1)
BEGIN
  PRINT 'No login(s) found.'
  CLOSE login_curs
  DEALLOCATE login_curs
  RETURN -1
END
SET @tmpstr = '/* sp_help_revlogin script '
PRINT @tmpstr
SET @tmpstr = '** Generated ' + CONVERT (varchar, GETDATE()) + ' on ' + @@SERVERNAME + ' */'
PRINT @tmpstr
PRINT ''
WHILE (@@fetch_status <> -1)
BEGIN
  IF (@@fetch_status <> -2)
  BEGIN
    PRINT ''
    SET @tmpstr = '-- Login: ' + @name
    PRINT @tmpstr
    IF (@type IN ( 'G', 'U'))
    BEGIN -- NT authenticated account/group

      SET @tmpstr = 'CREATE LOGIN ' + QUOTENAME( @name ) + ' FROM WINDOWS WITH DEFAULT_DATABASE = [' + @defaultdb + ']'
    END
    ELSE BEGIN -- SQL Server authentication
        -- obtain password and sid
            SET @PWD_varbinary = CAST( LOGINPROPERTY( @name, 'PasswordHash' ) AS varbinary (256) )
        EXEC sp_hexadecimal @PWD_varbinary, @PWD_string OUT
        EXEC sp_hexadecimal @SID_varbinary,@SID_string OUT
 
        -- obtain password policy state
        SELECT @is_policy_checked = CASE is_policy_checked WHEN 1 THEN 'ON' WHEN 0 THEN 'OFF' ELSE NULL END FROM sys.sql_logins WHERE name = @name
        SELECT @is_expiration_checked = CASE is_expiration_checked WHEN 1 THEN 'ON' WHEN 0 THEN 'OFF' ELSE NULL END FROM sys.sql_logins WHERE name = @name
 
            SET @tmpstr = 'CREATE LOGIN ' + QUOTENAME( @name ) + ' WITH PASSWORD = ' + @PWD_string + ' HASHED, SID = ' + @SID_string + ', DEFAULT_DATABASE = [' + @defaultdb + ']'

        IF ( @is_policy_checked IS NOT NULL )
        BEGIN
          SET @tmpstr = @tmpstr + ', CHECK_POLICY = ' + @is_policy_checked
        END
        IF ( @is_expiration_checked IS NOT NULL )
        BEGIN
          SET @tmpstr = @tmpstr + ', CHECK_EXPIRATION = ' + @is_expiration_checked
        END
    END
    IF (@denylogin = 1)
    BEGIN -- login is denied access
      SET @tmpstr = @tmpstr + '; DENY CONNECT SQL TO ' + QUOTENAME( @name )
    END
    ELSE IF (@hasaccess = 0)
    BEGIN -- login exists but does not have access
      SET @tmpstr = @tmpstr + '; REVOKE CONNECT SQL TO ' + QUOTENAME( @name )
    END
    IF (@is_disabled = 1)
    BEGIN -- login is disabled
      SET @tmpstr = @tmpstr + '; ALTER LOGIN ' + QUOTENAME( @name ) + ' DISABLE'
    END
    PRINT @tmpstr
  END

  FETCH NEXT FROM login_curs INTO @SID_varbinary, @name, @type, @is_disabled, @defaultdb, @hasaccess, @denylogin
   END
CLOSE login_curs
DEALLOCATE login_curs
RETURN 0
GO

Use CURSOR to iterate through table.sql

--Declare variables to hold values for each iteration
DECLARE @field1 nvarchar(50), @field2 nvarchar(50), @field3 nvarchar(50)

--Declare cursor for a select statement
DECLARE cur CURSOR FOR
SELECT [Field1]
	  ,[Field2]
      ,[Field3]
  FROM [Table1]
  WHERE [Field4]='SomeValue'

--Open cursor for use
OPEN cur

--Get the first line from the cursor and place the values into declared variables
FETCH NEXT FROM cur INTO @field1, @field2, @field3
WHILE (@@fetch_status <> -1)
BEGIN
	--Perform action based on current line's variables
	INSERT INTO [Table2]
	(Field1, Field2, Field3, Field4)
	VALUES
	(@field1, @field2, @field3, 'OtherValue')

	--!IMPORTANT!
	--Iterate to the next line in the cursor
	FETCH NEXT FROM cur INTO @field1, @field2, @field3
END

--Close and deallocate cursor
CLOSE cur
DEALLOCATE cur