2018.11.22 / 01:52
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MySQL¿¡¼ NULL°ªÀÎ °Í, NULL°ªÀÌ ¾Æ´Ñ °Í °Ë»ö
1. where Ä®·³¸í is NULL
2. where Ä®·³¸í <=> NULL
NULLÀÌ ¾Æ´Ñ°ÍÀ» °Ë»ö
1. where Ä®·³¸í is not NULL
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