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sql中的字符串转数字

sql中的字符串转数字

作者: 落寒z | 来源:发表于2018-03-14 10:19 被阅读73次

sql语句中字符串转数字的几种方式-----升序方式排列

1.CAST(ordernum AS SIGNED integer)

SELECT ordernum FROM OfficeMenu ORDER BY CAST(ordernum AS SIGNED integer) asc;

2.CAST(ordernum AS SIGNED)

SELECT ordernum FROM OfficeMenu ORDER BY CAST(ordernum AS SIGNED) asc;

3."123"+0

SELECT ordernum FROM OfficeMenu ORDER BY ordernum+0 asc;
  1. 隐式转换 -"123"
SELECT ordernum FROM OfficeworkMenu ORDER BY -ordernum desc;

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