ROW_NUMBER 个新列

Question

是否可以按 row_number 内的新列进行排序？ 我想做这样的事情：

select text1 + text2 as NEW_TEXT, row_number over (order by NEW_TEXT) from table

但是这样的排序不起作用（我得到随机结果）。

Answer 1

您必须重复表达式 text1 + text2

select text1 + text2 as NEW_TEXT, 
row_number() over (order by text1 + text2)
from table

或分步执行（foo 可能是这里的 CTE）

SELECT
    NEW_TEXT,
    row_number() over (order by NEW_TEXT)
FROM
    (
    select text1 + text2 as NEW_TEXT from table
    ) foo

Answer 2

另一种选择是将初始结果包装在子选择中，并在此子选择上应用ROW_NUMBER。

SQL语句

SELECT  NEW_TEXT
        , ROW_NUMBER() OVER (ORDER BY NEW_TEXT)     
FROM    (       
            SELECT  text1 + text2 AS NEW_TEXT       
            FROM    [table]
        ) q         

测试数据

;WITH [table] (text1, text2) AS (
    SELECT '1', '1'
    UNION ALL SELECT '1', '0'
    UNION ALL SELECT '2', '2'
    UNION ALL SELECT '2', '1'
)
SELECT  NEW_TEXT
        , ROW_NUMBER() OVER (ORDER BY NEW_TEXT)     
FROM    (       
            SELECT  text1 + text2 AS NEW_TEXT       
            FROM    [table]
        ) q         

Answer 3

您可以使用子查询来完成此操作，如下所示：

select NEW_TEXT, row_number() over (order by NEW_TEXT)
from
(
    select Text1 + Text2 as NEW_TEXT
    from TestTable
) TempTable

Answer 4

select text1 + text2 as NEW_TEXT, 
row_number over (order by text1 + text2) 
from table