在 SQL Server 中组合日期、月份、年份列

Question

DD(10)-MM(05)-YYYY(2013)

I have a table with DATE , MONTH , YEAR in separate columns. How I can combine them into a single column Created date ?

Output must be: 10-05-2013 ( DD-MM-YYYY format)

Answer 1

SELECT RIGHT('00' + DAY, 2) + '-' + RIGHT('00' + MONTH, 2) + '-' + YEAR AS Date 
FROM YourTable

Answer 2

I guess you want have a date field instead of a string. So use TO_DATE() function. You can format date anyway you want later.

TO_DATE(YEAR + '/' + MONTH + '/' + DATE, 'yyyy/mm/dd')

Answer 3

您可以轻松做到：

SELECT to_char(TO_DATE('10 01 2014', 'DD MM YYYY'),'dd-mm-yyyy') AS MYDATE FROM DUAL

Answer 4

要连接列，您只需要在选择语句中使用“+”

SELECT DATE + '-'+ MONTH + '-'+ YEAR FROM table