Question

I have a big procedure which consists mostly dynamic SQL. I am having issues with setting one of the date fields.

DECLARE @WorkDate DATETIME 

SET @WorkDate = 'SELECT MIN(__Insert_Date) FROM  ' + @DatabaseName + '.'
                            + @SchemaName + '.' + @TableName + '_Hist'

SET @WorkDate = DATEADD(DAY, DATEDIFF(DAY, '19000101', @WorkDate), '19000101')

This is part of a big procedure. So when I execute the above query I am getting this error:

Msg 241, Level 16, State 1, Line 68
Conversion failed when converting date and/or time from character string.

Answer 1

@WorkDate is DATETIME and your setting it at as a sting thats why the conversion is failing
EDIT :

Try this:

DECLARE @WorkDate DATETIME, @WorkDateString varchar(100)

SET @WorkDateString = 'SELECT MIN(__Insert_Date) FROM  ' + @DatabaseName + '.'
                        + @SchemaName + '.' + @TableName + '_Hist'

SET @WorkDate = DATEADD(DAY, DATEDIFF(DAY, '19000101', @WorkDate), '19000101')

If you need to insert the @WorkDate into the select string where __Insert_Date is then you need to reverse the order to look like this

DECLARE @WorkDate DATETIME, @WorkDateString varchar(100)

SET @WorkDate = DATEADD(DAY, DATEDIFF(DAY, '19000101', @WorkDate), '19000101')

SET @WorkDateString = 'SELECT MIN(' + CAST(@WorkDate as varchar(19)) + ') FROM  ' + @DatabaseName + '.'
                        + @SchemaName + '.' + @TableName + '_Hist'

Don’t know if you looking to insert the @WorkDate into the select string but that’s how you could accomplish that