substring(update_time from 1 for 10)
时间: 2024-04-20 17:24:59 浏览: 9
The substring function in SQL is used to extract a part of a string. In the given example, the substring function is applied to the "update_time" column and it extracts the substring starting from the first character and with a length of 10 characters. This will give you the first 10 characters of the "update_time" value.
相关问题
regexp_replace(substring(update_time,1,10),‘-’,‘’)
This regular expression will replace any '-' character in the first 10 characters of the 'update_time' string with an empty string, effectively removing any dashes from the date format. This can be used to convert a date string in the format 'YYYY-MM-DD' to 'YYYYMMDD'.
SELECT * FROM T_QZSJ_BJJGXX where f_updatetime > ? 怎么截取 T_QZSJ_BJJGXX
你可以使用字符串函数来截取表名 T_QZSJ_BJJGXX。在大多数数据库中,可以使用SUBSTRING函数来截取字符串的一部分。假设你的数据库使用的是SQL Server,你可以像这样编写查询:
```sql
SELECT * FROM SUBSTRING('T_QZSJ_BJJGXX', 3, LEN('T_QZSJ_BJJGXX')-2)
WHERE f_updatetime > ?
```
这个查询将截取字符串的第三个字符开始的部分,并将其作为表名。请注意,具体的截取方式可能因数据库类型而异,你需要根据你所使用的数据库的文档来确定正确的语法。