Question

我的varchar表中有一个SQL列，其格式如下：

000001
006420
000100
009999

查询表时，我需要更改此格式，以使其显示为以下格式：

0001
6420
0100
9999

您会注意到，新格式已删除了两个前导零。

我已经尝试使用以下方法进行此操作：

RIGHT(ColumnName, 4) AS NewColumnFormat
SUBSTRING(ColumnName, 3, 4) AS NewColumnFormat

但是当我将其应用于诸如 000010 的数字时，它显示为 0001 ，而将诸如 000001 的数字显示为 0000 等。

以下是我一直在使用的查询：

SELECT DISTINCT TOP 1000
    SUBSTRING(H.EMPREF, 3, 4) AS NewColumnFormat
    ,(SELECT TOP 1 CASE WHEN H1.[NEWVALUE] = 'E' THEN 'Employee' ELSE H1.[NEWVALUE] END FROM [HISTORY] H1 WHERE H1.[FIELDNAME] = 'EMPTYPE' AND H.[EMPREF] = H1.[EMPREF] ORDER BY H1.CHANGEDATE DESC) AS EMPTYPE
    ,(SELECT TOP 1 H2.[NEWVALUE] FROM [HISTORY] H2 WHERE H2.[FIELDNAME] = 'TITLE' AND H.[EMPREF] = H2.[EMPREF] ORDER BY H2.CHANGEDATE DESC) AS TITLE
    ,(SELECT TOP 1 H3.[NEWVALUE] FROM [HISTORY] H3 WHERE H3.[FIELDNAME] = 'FIRSTNAMES' AND H.[EMPREF] = H3.[EMPREF] ORDER BY H3.CHANGEDATE DESC) AS FIRSTNAMES
    ,(SELECT TOP 1 H4.[NEWVALUE] FROM [HISTORY] H4 WHERE H4.[FIELDNAME] = 'SURNAME' AND H.[EMPREF] = H4.[EMPREF] ORDER BY H4.CHANGEDATE DESC) AS SURNAME
    ,(SELECT TOP 1 H5.[NEWVALUE] FROM [HISTORY] H5 WHERE H5.[FIELDNAME] = 'DEPARTMENT' AND H.[EMPREF] = H5.[EMPREF] ORDER BY H5.CHANGEDATE DESC) AS DEPARTMENT
    ,(SELECT TOP 1 H6.[NEWVALUE] FROM [HISTORY] H6 WHERE H6.[FIELDNAME] = 'SECTIONMGR' AND H.[EMPREF] = H6.[EMPREF] ORDER BY H6.CHANGEDATE DESC) AS SECTIONMGR
    ,(SELECT TOP 1 H7.[NEWVALUE] FROM [HISTORY] H7 WHERE H7.[FIELDNAME] = 'HR2' AND H.[EMPREF] = H7.[EMPREF] ORDER BY H7.CHANGEDATE DESC) AS HR2
    ,(SELECT TOP 1 H9.[NEWVALUE] FROM [HISTORY] H9 WHERE H9.[FIELDNAME] = 'JOBTITLE' AND H.[EMPREF] = H9.[EMPREF] ORDER BY H9.CHANGEDATE DESC) AS JOBTITLE
FROM 
    [HISTORY] H
WHERE (H.TABLENAME = 'EMP' OR H.TABLENAME = 'OD' OR H.TABLENAME = 'SMS' OR H.TABLENAME = 'JD')
ORDER BY NewColumnFormat

我得到以下输出：

+-----------------+----------+-------+------------+---------+------------+------------+------+----------+
| NewColumnFormat | EMPTYPE  | TITLE | FIRSTNAMES | SURNAME | DEPARTMENT | SECTIONMGR | HR2  | JOBTITLE |
+-----------------+----------+-------+------------+---------+------------+------------+------+----------+
|            0000 | Employee | Mr    | Test       | Record  | LB         |            | NULL |          |
|            0001 | Employee | Mr    | Test       | Record  | AB         |            | NULL |          |
|            0002 | Employee | Mr    | Test       | Record  | LB         |            | NULL |          |
|            0003 | Employee | Mr    | Test       | Record  | LB         |            | NULL |          |
|            0004 | Employee | Mr    | Test       | Record  | BO         |            | NULL |          |
|            0005 | Employee | Mr    | Test       | Record  | BO         |            | NULL |          |
|            0006 | Employee | Mr    | Test       | Record  | AB         |            | NULL |          |
|            0007 | Employee | Mr    | Test       | Record  | RET        |            | NULL |          |
|            0008 | Employee | Mr    | Test       | Record  | DES        |            | NULL |          |
+-----------------+----------+-------+------------+---------+------------+------------+------+----------+

“ NewColumnFormat”的格式显示不正确的地方在哪里呢？

Answer 1

SELECT FORMAT(12, '0000') as pad_to_4
--> 0012

SELECT FORMAT(CONVERT(INT, '12'), '0000') as pad_to_4
--> 0012

SELECT FORMAT(CONVERT(INT, '000012'), '0000') as pad_to_4
--> 0012

大于4的数字保持原样（或丢失前导零）：

SELECT FORMAT(CONVERT(INT, '123456'), '0000') as pad_to_4
--> 123456

SELECT FORMAT(CONVERT(INT, '00123456'), '0000') as pad_to_4
--> 123456

但是，当我将其应用于000010之类的数字时，它显示为0001，而像000001之类的数字则显示为0000，依此类推。

顺便说一下，我无法复制您的投诉：

SELECT RIGHT('000010', 4) AS NewColumnFormat
--> 0010

SELECT SUBSTRING('000010', 3, 4) AS NewColumnFormat
--> 0010

这让我认为基本问题是EMPREF所涉及的问题，而不是您所想的。

Answer 2

更新MyTable SET ColumnName = RIGHT（ColumnName，LEN（ColumnName）-2）;

请让我知道您的结果。谢谢。

Answer 3

SELECT LPAD (0000012,4,0)
--> 0012

如何在SQL中删除一些（不是全部）前导零

3 个答案: