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あぁ、久しぶりだとまたハマるっていう（笑）
MySQL のNULL ではまったことあれこれ – Slow Dance.
MySQLでのSQLで
ある項目が NULL のもの出したいのに・・・
SELECT * FROM SAMPLE WHERE ID = NULL
とか 書いても何も出ない・・・
じゃあアレか！と思って
SELECT * FROM SAMPLE WHERE ID = ”
あれ・・・これもダメか・・・ 空文字とNULLの意味は違うんですよ。 ・・・知ってるよ！！( ｀д´) ｹｯ!
結果的には NULL かどうかを調べるには IS NULL って書けや！ って話なんさ。
なんでもいっつも忘れるんだろうか・・・
要するに！！
SELECT * FROM SAMPLE WHERE ID IS NULL
ってことでしたーーー！
知ってるよ・・・( ｀д´) ｹｯ!
ちょっぴり自己嫌悪（笑）
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