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sql查询语句中to_ChAr和trunC在限制时间是的区别

Oracle的连接符号是|| 对应的sqlserver的是+

1.日期和字符转换函数用法(to_date,to_char) select to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') as nowTime from dual; //日期转化为字符串 select to_char(sysdate,'yyyy') as nowYear from dual; //获取时间的年 select to_char(sysdate,'mm...

select * from a ,b where trunc(a.date1) = trunc(b.date1(+));

StudentGirl() 返回的是数据表, 用select StudentGirl() 这样是输出单列值, 不是整张表的数据, 所以可以把 StudentGirl()直接当成一张表使用, 如: SELECT * FROM dbo.StudentGirl() WHERE ..... 可以加条件, 按照正常的查表语句都OK

SELECT CONVERT(VARCHAR(10),work_time+'05:00',120),Max(work_time),MIN(work_time) FROM frist_time WHERE work_time BETWEEN '2014-05-01' AND '2014-06-01' GROUP BY CONVERT(VARCHAR(10),work_time+'05:00',120) ORDER BY CONVERT(VARCHAR(...

TRUNC没法处理字符串,只能处理时间和数字,建议用substr截取字符串吧 substr(string1,1,2) string1 需要截取的字符串 1表示起始位置 2 表示截取长度 按理说TO_CHAR(hiredate,'year')就能直接用了,或者用TO_CHAR(hiredate,'yyyy')

$ sqlite3SQLite version 3.7.7 2011-06-23 19:49:22Enter ".help" for instructionsEnter SQL statements terminated with a ";"sqlite> sqlite> select datetime("now");2014-01-06 03:50:08sqlite> select datetime("now", "start of day");2...

SQL> select to_char(dtime,'yyyymmdd hh24:mi:ss') dtime,v1,v2 from test order by 1; DTIME V1 V2 ----------------- ------ ------ 20100929 10:22:13 200 200 20100929 10:32:13 200 200 20100929 15:32:06 200 200 20100929 15:42:06 200 ...

你需要的是一个什么类型?如果是日期格式,那么:to_date(to_char(sysdate–1,'dd'),'mm/dd')。如果是字符串,那就去掉前面的to_date

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