Truncate multiple tables in one MySQL statement


Is there a possibility to truncate with one SQL statement, multiple tables?

Like this:

 truncate table #OBJ_AvailabilityTraining, #OBJ_AvailabilityHoliday, #Dates_temp;

Regards


Answers:


No, you can only truncate a single table with TRUNCATE command. To truncate multiple tables you can use T-SQL and iterate through table names to truncate each at a time.

DECLARE @delimiter CHAR(1),
        @tableList VARCHAR(MAX),
        @tableName VARCHAR(20),
        @currLen INT

SET @delimiter = ','

SET @tableList = 'table1,table2,table3'

WHILE LEN(@tableList) > 0
BEGIN
    SELECT @currLen = 
    (
        CASE charindex( @delimiter, @tableList ) 
            WHEN 0 THEN len( @tableList  ) 
            ELSE ( charindex( @delimiter, @tableList  ) -1 )
        END
    ) 

    SELECT @tableName = SUBSTRING (@tableList,1,@currLen )

    TRUNCATE TABLE @tableName

    SELECT tableList = 
    (
        CASE ( len( @tableList ) - @currLen  ) 
            WHEN 0 THEN '' 
            ELSE right( @tableList, len( @tableList ) - @currLen  - 1 ) 
        END
    ) 
END

You can have all your table names comma separated in @tableList variable and yes you can truncate multiple tables from different schemas if they are prefixed.