MySQL判断字符串是否是数字

admin2年前 (2022-12-27)mysql455

SELECT * FROM **** WHERE trim(字段名) REGEXP '[^0-9]'=1

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select count(id),字段from 表名 group by字段 having count(字段)>1;...

设置my.cnf : auto-rehashmysql>use mysql; #这是关键...

SELECT product_brand FROM shop_product WHERE LENGTH(product_brand)>...

DELETE t1 FROM invest_year t1, invest_year t2 WHERE t1.pro_id = t2.pro_id AND t1.pro_year = t...

SELECT * from system_user LIMIT 60,20limit是设置分页的关键他可以控制数据输出偏移SELECT column_name,column_name FR...

1.date型转换成int型 UNIX_TIMESTAMP('2007-10-04 22:23:00') 2.int型转换成date型 FROM_UNIXTIME(97599...

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