将字符添加到从SELECT返回的所有行

Question

我想在列的中间插入连字符到表的所有行。我非常确定这里有一个内置功能。

如何指定将连字符放在列中的位置？

Answer 1

测试数据

DECLARE @TABLE TABLE (MMDD_INT INT, MMDD_CHAR VARCHAR(4))
INSERT INTO @TABLE 
 VALUES 
        (1201, '1201'),
        (1110, '1110'),
        (910 , '0910'),
        (101,  '0101')

查询

SELECT   LEFT(RIGHT('0'+CAST(MMDD_INT AS VARCHAR(4)), 4),2)
         + '-' + RIGHT(CAST(MMDD_INT AS VARCHAR(4)),2)   AS  Int_Column

        ,LEFT(MMDD_CHAR, 2) + '-'+ RIGHT(MMDD_CHAR, 2)   AS  Char_Column

FROM @TABLE

结果

╔════════════╦═════════════╗
║ Int_Column ║ Char_Column ║
╠════════════╬═════════════╣
║ 12-01      ║ 12-01       ║
║ 11-10      ║ 11-10       ║
║ 09-10      ║ 09-10       ║
║ 01-01      ║ 01-01       ║
╚════════════╩═════════════╝