MAKE_SET
Sintassi
MAKE_SET(bit, str1, str2,...)
Spiegazione
Restituisce un valore set (una stringa contenente le sottostringhe separate da caratteri ","), formata dalle stringhe che corrispondono ai bit impostati a vero nell'argomento bit. str1
corrisponde al bit 0, str2
al bit 1, e così via. I valori NULL in str1
, str2
, etc, non vengono aggiunti al risultato.
Esempi
SELECT MAKE_SET(1,'a','b','c'); +-------------------------+ | MAKE_SET(1,'a','b','c') | +-------------------------+ | a | +-------------------------+ SELECT MAKE_SET(1 | 4,'hello','nice','world'); +----------------------------------------+ | MAKE_SET(1 | 4,'hello','nice','world') | +----------------------------------------+ | hello,world | +----------------------------------------+ SELECT MAKE_SET(1 | 4,'hello','nice',NULL,'world'); +---------------------------------------------+ | MAKE_SET(1 | 4,'hello','nice',NULL,'world') | +---------------------------------------------+ | hello | +---------------------------------------------+ SELECT QUOTE(MAKE_SET(0,'a','b','c')); +--------------------------------+ | QUOTE(MAKE_SET(0,'a','b','c')) | +--------------------------------+ | '' | +--------------------------------+
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