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 阅读(64) 评论(0) 推荐(0)
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 阅读(31) 评论(0) 推荐(0)