use LIKE with and without wildcards ( % and _ )
IMHO things like left/pos etc are too complex for a non-developer to use. you get similar results with LIKE
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a logical OR is implied when you use multiple rows for query mode. works best with grid datawindows.
AND can be entered as a value and it ands the queries in rows instead of ORing them. That is how you do date ranges:
> 1/1/2018 AND
< 12/31/2018
again, works best with grid datawindows.
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you can use LIKE with any variations that your database supports such as the use of brackets: MSSQL/ASE supports: like [ABC]%
but not oracle
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you CAN code your program to automatically prefix entered text with LIKE and postfix with % - which makes it easier for users that don't get the concept of LIKE.
NOTE: querymode hasn't been updated since forever - some sql that should work does not.