MySQL 特殊语句

转自：http://www.phpweblog.net/kiyone/archive/2007/05/11/1195.html

例子：将cdb_pms表subject字段中的Welcom to替换成 欢迎光临

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UPDATE `cdb_pms` 

SET `subject` = REPLACE(`subject`, 'Welcome to', '欢迎光临') 

WHERE INSTR(`subject`,'Welcome to') > 0
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替换cdb_posts表的message字段，将“viewthread.php?tid=3989”替换成“viewthread.php?tid=16546”
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UPDATE `cdb_posts` 

SET `message`= REPLACE(`message`, 'viewthread.php?tid=3989', 'viewthread.php?tid=16546') 

WHERE INSTR(`message`,'viewthread.php?tid=3989') > 0 ;
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 删除所有的空格

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UPDATE `es_product`   SET `pro_pub_time` = TRIM(`pro_pub_time`)

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删除所有饱含'['或者']'或者'.'的字符

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UPDATE `es_product`   SET `pro_pub_time` = REPLACE(`pro_pub_time`, '[','')   WHERE INSTR(`pro_pub_time`,'[') > 0

UPDATE `es_product`   SET `pro_pub_time` = REPLACE(`pro_pub_time`, ']','')   WHERE INSTR(`pro_pub_time`,']') > 0

UPDATE `es_product`   SET `pro_pub_time` = REPLACE(`pro_pub_time`, '.','-')   WHERE INSTR(`pro_pub_time`,'.') > 0

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替换所有含中文'-'的为英文'-'

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UPDATE `es_product`   SET `pro_pub_time` = REPLACE(`pro_pub_time`, '－','-')   WHERE INSTR(`pro_pub_time`,'－') > 0

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将所有的年月都替换成'-'

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UPDATE `es_product`   SET `pro_pub_time` = REPLACE(`pro_pub_time`, '年','-')   WHERE INSTR(`pro_pub_time`,'年') > 0

UPDATE `es_product`   SET `pro_pub_time` = REPLACE(`pro_pub_time`, '月','-')   WHERE INSTR(`pro_pub_time`,'月') > 0

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将所有'2005-04-'这种类型的替换成'2005-04-01'

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UPDATE `es_product`   SET `pro_pub_time` = CONCAT( `pro_pub_time`, '01')   WHERE SUBSTRING_INDEX( `pro_pub_time`, '-', -1) = '' AND LENGTH(`pro_pub_time`) > 0 AND LENGTH(`pro_pub_time`) > 5

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将所有'2005-'这种类型替换成'2005-01-01'

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UPDATE `es_product`   SET `pro_pub_time` = CONCAT( `pro_pub_time`, '01-01') WHERE INSTR(`pro_pub_time`,'-') > 0 AND   LENGTH(`pro_pub_time`) = 5

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将所有 饱含'-',但是位数小于8的改成追加'-01'

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UPDATE `es_product`   SET `pro_pub_time` = CONCAT( `pro_pub_time`, '-01') WHERE INSTR(`pro_pub_time`,'-') > 0 AND   LENGTH(`pro_pub_time`) < 8

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将所有'2005'这样的改成'2005-01-01'

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UPDATE `es_product`   SET `pro_pub_time` = CONCAT(`pro_pub_time`,'-01-01') WHERE INSTR(`pro_pub_time`,'-') = 0 AND   LENGTH(`pro_pub_time`) = 4

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最后将所有'2005-01-01'格式化成'2005年01月'

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UPDATE `es_product`   SET `pro_pub_time` = DATE_FORMAT(`pro_pub_time`,'%Y年%m月') WHERE INSTR(`pro_pub_time`,'-') > 0

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