Question

I want to convert a string “PERIOD” in this form yyyymmdd (eg: 20120701) into date in SQLServer.
So I used the convert function like this:

CONVERT(DATETIME,PERIOD,102);

and

 CONVERT(DATETIME,PERIOD,120);

but I’m getting an

SqlException: “Arithmetic overflow error converting expression to
data type datetime.”

This is the whole query, is there any other mistake in this?

"SELECT ACTUAL_N_WELLS, TARGET_N_WELLS, [YTD ACTUAL] AS YTD_ACTUAL, [YTD BUDGET] AS YTD_BUDGET FROM DASH_GL_DRILLING_PERF WHERE ASSET_NAME='Bu Hasa Asset' AND ( CONVERT(DATETIME,PERIOD,112) > (SELECT DATEADD(MONTH,-3,MAX(CONVERT(DATETIME,PERIOD,112))) from DASH_GL_DRILLING_PERF))");

What is the correct way to do this?

Answer 1

If it were a date format issue you would get an out-of-range error, as your getting an overflow error check your not using an integer

CONVERT(DATETIME, 20120701, 102) - overflow
CONVERT(DATETIME,'20120701',102) - ok