数据库|mysql教程
sqllite,判断,某个,是否,在于,中了,如果,存在,插
数据库-mysql教程
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判断某个id是否存在于表中了，如果存在则不插入，不存在则插入 无 INSERT INTO USER (email,ADDTIME) (SELECT ’email’,’addTime’ FROM USER u2 JOIN( SELECT COUNT(*) num FROM USER u1 WHERE u1.id = 87) u3 ON u3.num 1 LIMIT 1)
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判断 某个id是否存在于表中了，如果存在则不插入，不存在则插入
.CodeEntity .code_pieces ul.piece_anchor{width:25px;position:absolute;top:25px;left:-30px;z-index:1000;}.CodeEntity .code_pieces ul.piece_anchor li{width:25px;background: #efe;margin-bottom:2px;}.CodeEntity .code_pieces ul.piece_anchor li{border-left:3px #40AA63 solid;border-right:3px #efe solid;}.CodeEntity .code_pieces ul.piece_anchor li:hover{border-right:3px #40AA63 solid;border-left:3px #efe solid;}.CodeEntity .code_pieces ul.piece_anchor li a{color: #333;padding: 3px 10px;}.CodeEntity .code_pieces .jump_to_code{visibility:hidden;position:relative;}.CodeEntity .code_pieces .code_piece:hover .jump_to_code{visibility:visible;}.CodeEntity .code_pieces .code_piece:hover .jump_to_code a{text-decoration:none;}.CodeEntity .code_pieces h2 i{float:right;font-style:normal;font-weight:normal;}.CodeEntity .code_pieces h2 i a{font-size:9pt;background: #FFFFFF;color:#00A;padding: 2px 5px;text-decoration:none;}
INSERT INTO USER (email,ADDTIME) (SELECT email,addTime FROM USER u2 JOIN( SELECT COUNT(*) num FROM USER u1 WHERE u1.id = 87) u3 ON u3.num < 1 LIMIT 1)
