DS

[dsisbank]

Hİ,
I wrote a routine to run sql string.I used DSExecute function. When i use below, sql there is no problem.
Select NVL(COUNT(*),0) FROM gen_takvim.
But i use below, it return errors.
Select NVL(COUNT(*),0) FROM gen_takvim where tamgun = 'D'

the error is "ORA-00904: "D": invalid identifier"
I tried so many like '''D''' OR : " ' D ' " and more. But i havent archievied yet.
May you help me?