Am 01.02.24 um 07:51 schrieb LacaK via lazarus:
Hi,
IMO AVG() should produce floating point result.
https://www.sqlite.org/lang_aggfunc.html#aggfunclist: The result of
avg() is always a floating point value whenever there is at least one
non-NULL input even if all inputs are integers.
In SQLite plays role column affinity. I expect that "km_gelaufen" is
of NUMERIC or REAL affinity.
What result (in TDBGrid) gives: SELECT CAST(AVG(km_gelaufen) AS REAL)
FROM laufdaten ?
L.
Ok, *solution* is to CAST AS Varchar the result:
SELECT CAST(AVG(km_gelaufen) AS VARCHAR) FROM laufdaten
But i don't understand why i do have to cast the result ...
In my SQlite Database laufdaten.db column "km_gelaufen" is of Type
float. But SQlite does not know this type and if i understood that
correct SQLite creates this type as needed?!
If i execute: "SELECT CAST(AVG(km_gelaufen) *AS REAL*) FROM laufdaten"
the known problem of integer only shows up again.
BUT:
If i execute this "SELECT CAST(AVG(km_gelaufen) AS REAL) FROM laufdaten
" in SQliteStudio it works as it should.
Is DBgrid or Zeos Access components the culpit? I don't know.
But for me at the moment its ok now because i know how to circumvent
this problem with CAST() as VARCHAR
--
_______________________________________________
lazarus mailing list
lazarus@lists.lazarus-ide.org
https://lists.lazarus-ide.org/listinfo/lazarus
