ROW_NUMBER在新列上

Question

是否可以按row_number内的新列排序?我想这样做:

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

，但这样的排序不起作用(我得到随机结果)。

Answer 1

必须重复表达式text1 + text2

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

或者分步骤执行(foo在这里可以是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，并对该子选择应用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

你可以这样使用子查询:

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