DECLARE @MyValue int SELECT @MyValue = Column1 WHERE Column2 > 50 IF @MyValue IS NULL BEGIN RAISEERROR(‘This is my custom message from SQL.’, 16, 1) END ELSE SELECT MyValue END Use an error code within 11-16, or just use 16 for a “general” case. RAISERROR(‘This is my custom message from SQL.’,16,1) Why? Here’s summary of […]
SELECT COLUMN_NAME, DATA_TYPE, IS_NULLABLE, CHARACTER_MAXIMUM_LENGTH, NUMERIC_PRECISION, NUMERIC_SCALE FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME=’your_table_name’;
Declare @Parameter1 int; Declare @Parameter2 int; DECLARE Cur1 CURSOR FOR SELECT Column1 From Table1; OPEN Cur1 FETCH NEXT FROM Cur1 INTO @Parameter1; WHILE @@FETCH_STATUS = 0 BEGIN PRINT ‘Processing Column1: ‘ + Cast(@Parameter1 as Varchar); DECLARE Cur2 CURSOR FOR SELECT Column2 FROM Table2 Where Column2 = @Parameter1; OPEN Cur2; FETCH NEXT FROM Cur2 INTO @Parameter2; […]
SELECT (SCHEMA_NAME(A.schema_id) + ‘.’ + A.Name) AS TableName , SUM(B.rows) AS RecordCount FROM sys.objects A INNER JOIN sys.partitions B ON A.object_id = B.object_id WHERE A.type = ‘U’ GROUP BY A.schema_id, A.Name ORDER BY RecordCount DESC
If you only want to match N” as an empty string SELECT COLUMN FROM TABLE WHERE DATALENGTH(COLUMN) > 0 If you want to count any string consisting entirely of spaces as empty SELECT COLUMN FROM TABLE WHERE COLUMN <> ” If you want to use DATALENGTH for any string consisting entirely of spaces then you […]
SELECT m1.Column1, m1.Column2, m1.Column3, r.MaxTime FROM ( SELECT Column1, MAX(TimeColumn) as MaxTime FROM MyTable GROUP BY Column1 ) r INNER JOIN MyTable m1 ON m1.Column1= r.Column1AND m1.TimeColumn = r.MaxTime
The SQL Server CONCAT_WS() function concatenates two or more strings into one string with a separator. CONCAT_WS() means concatenate with separator.
Please note that with a little bit changing you can also use this query as a stored procedure.
Always use with statement like ;WITH then you’ll never get this error. The WITH command required a ; between it and any previous command, by always using ;WITH you’ll never have to remember to do this.
CHECKPOINT GO –Cleaen Query Cache DBCC DROPCLEANBUFFERS; GO –Clean Execution Plan Cache DBCC FREEPROCCACHE; GO
Creating Local Temp Table [with #]: SELECT TOP(10) ID INTO #TempTable FROM MyTable Craeting Global Temp Table [with ##]: SELECT TOP(10) ID INTO ##TempTable FROM MyTable Reaching Local Temp Table with Query: SELECT name FROM tempdb..sysobjects WHERE name LIKE ‘#TempTable%’
SET IDENTITY_INSERT MyTable ON INSERT INTO MyTable (IdentityColumn, col2, col3, …) VALUES (IdentityValue, col2value, col3value, …) SET IDENTITY_INSERT MyTable OFF Note that you can not insert explicit value for identity column in table ‘MyTable’ when IDENTITY_INSERT is set to OFF.
DBCC CHECKIDENT(‘TableName’, RESEED, 0) Note that after running DBCC CHECKIDENT(‘TableName’, RESEED, 0): – Newly created tables will start with identity 0 – Existing tables will continue with identity 1
The UNIQUE constraint ensures that all values in a column are different. Both the UNIQUE and PRIMARY KEY constraints provide a guarantee for uniqueness for a column or set of columns. A PRIMARY KEY constraint automatically has a UNIQUE constraint. However, you can have many UNIQUE constraints per table, but only one PRIMARY KEY constraint […]