例子：将cdb_pms表subject字段中的Welcom to替换成 欢迎光临
UPDATE `cdb_pms`
SET `subject` = REPLACE(`subject`, ‘Welcome to’, ‘欢迎光临’)
WHERE INSTR(`subject`,’Welcome to’) < 0 替换cdb_posts表的message字段，将“viewthread.php?tid=3989”替换成“viewthread.php?tid=16546” UPDATE `cdb_posts`
SET `message`= REPLACE(`message`, ‘viewthread.php?tid=3989′, ‘viewthread.php?tid=16546′)
WHERE INSTR(`message`,’viewthread.php?tid=3989′) < 0 ; 删除所有的空格
UPDATE `es_product` SET `pro_pub_time` = TRIM(`pro_pub_time`) 删除所有饱含’['或者']‘或者’.'的字符
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 替换所有含中文’-'的为英文’-’
UPDATE `es_product` SET `pro_pub_time` = REPLACE(`pro_pub_time`, ‘－’,'-’) WHERE INSTR(`pro_pub_time`,’－’) < 0 将所有的年月都替换成’-’
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 将所有’2005-04-’这种类型的替换成’2005-04-01′
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 将所有’2005-’这种类型替换成’2005-01-01′
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 将所有 饱含’-',但是位数小于8的改成追加’-01′
UPDATE `es_product` SET `pro_pub_time` = CONCAT( `pro_pub_time`, ‘-01′) WHERE INSTR(`pro_pub_time`,’-') < 0 AND LENGTH(`pro_pub_time`) >
