摘要:
substring() mysql> select substring('abc',1,1); + + | substring('abc',1,1) | + + | a | + + 1 row in set (0.00 sec) mid() mysql> select mid((select dat 阅读全文
posted @ 2023-07-13 17:02
baiye1
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摘要:
strcmp() strcmp(str1 , str2 ) = return 0; < return -1; > return 1; mysql> select strcmp((substr(database(),1,1)),0x73); + + | strcmp((substr(database( 阅读全文
posted @ 2023-07-13 16:56
baiye1
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