我的ORDER BY
条款如下:
...
ORDER BY CASE WHEN boolean_column is true THEN text_column END ASC,
CASE WHEN boolean_column is false THEN text_column END DESC
是否有可能在CASE
中替换第二个ELSE
?像往常一样,有两个条件而不是常规的if else/when else
感觉很奇怪。
您可以使用此技巧来缩短逻辑:
ORDER BY (CASE WHEN boolean_column THEN text_column END) ASC,
text_column DESC
它仍然是两个order by
键。
如果text_column的类型是数字。你可以试试这个。
ORDER BY CASE WHEN boolean_column is true THEN text_column
ELSE -1 * text_column END ASC
您可以先进行排序,获取每条记录的位置,然后选择排序方向
WITH rows_with_positions AS (
SELECT
boolean_column,
text_column,
ROW_NUMBER() OVER (ORDER BY text_column) AS position,
..
FROM your_table
)
SELECT text_column, ..
FROM rows_with_positions
ORDER BY
CASE WHEN boolean_column
THEN position
ELSE -1 * position
END
ASC