The POSSTR function returns the starting position of the first occurrence of one string (called the search-string) within another string (called the source-string). If the search-string is not found and neither argument is null, the result is zero. If the search-string is found, the result is a number from 1 to the actual length of the source-string.
The result of the function is a large integer. If either of the arguments can be null, the result can be null. If either of the arguments is null, the result is the null value.
The POSSTR function accepts mixed data strings. However, POSSTR operates on a strict byte-count basis without regard to single-byte or double-byte characters.1 It is recommended that if either the search-string or source-string contains mixed data, POSITION should be used instead of POSSTR. The POSITION function operates on a character basis. In an EBCDIC encoding scheme, any shift-in and shift-out characters are not required to be in exactly the same position, and their only significance is to indicate which characters are SBCS and which characters are DBCS.
If the CCSID of the search-string is different than the CCSID of the source-string, it is converted to the CCSID of the source-string. If the CCSID of the source-string is mixed data or UTF-8, CCSID conversion to UTF-16 will occur.
If a collating sequence other than *HEX is in effect when the statement that contains the POSSTR function is executed and the arguments are SBCS data, mixed data, or Unicode data, then the result is obtained by comparing weighted values for each value in the set. The weighted values are based on the collating sequence. An ICU collating sequence table cannot be specified with the POSSTR function.
If the search-string has a length of zero, the result returned by the function is 1. Otherwise:
SELECT RECEIVED, SUBJECT, POSSTR(NOTE_TEXT, 'GOOD') FROM IN_TRAY WHERE POSSTR(NOTE_TEXT, 'GOOD') <> 0