字串取代:REPLACE(欄位名稱
, ‘欲取代的字串’, ‘取代後的字串’)
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# 將efg開頭的字串取代 UPDATE `table` SET `column` = REPLACE(`column`, 'efg', 'zzz') WHERE `column` LIKE 'efg%'; 將efg結尾的字串取代 UPDATE `table` SET `column` = REPLACE(`column`, 'efg', 'zzz') WHERE `column` LIKE '%efg'; 將欄位column_2含有efg字串取代成zzz,不過將取代後的結果覆寫於column_1,不更動column_2原有的內容 UPDATE `table` SET `column_1` = REPLACE(`column_2`, 'efg', 'zzz') WHERE `column_2` LIKE '%efg%'; |
字串連接:CONCAT(‘字串1’, ‘字串2’, … ‘字串n’)
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# 於column值為456的資料行首插入字串123 UPDATE `table` SET `column` = CONCAT('123', `column`) WHERE `column`='456'; (Result: 123456) # 於column值為456的資料行尾插入字串123 UPDATE `table` SET `column` = CONCAT(`column`, '123') WHERE `column`='456'; (Result: 456123) # 於column值為456的資料行首插入字串123,行尾插入789 UPDATE `table` SET `column` = CONCAT('123', `column`, '789') WHERE `column`='456'; (Result: 123456789) 於column值為456的資料行首行尾各插入原值,使其值為重覆三次的字串 UPDATE `table` SET `column` = CONCAT(`column`, `column`, `column`) WHERE `column`='456'; (Result: 456456456) |