MySql 行入列、列入行

问题描述

我在将行转换为列以及将列转换为行时遇到问题.如果只是将行到列或列到行的转换，我可以做到这一点.

这是我的数据表

UNIT|JAN|FEB|MAR|APR|MEI|JUNCS-1|100|200|300|400|500|600CS-2|111|222|333|444|555|666CS-3|331|123|423|923|918|123

我想得到以下输出

MONTH|CS-1|CS-2|CS-3一月 |100 |111 |3312 月 |200 |222 |123三月 |300 |333 |423

等等.

有人知道怎么做吗?非常感谢！

你可以这样做

选择月份，MAX(CASE WHEN unit = 'CS-1' THEN value END) `CS-1`,MAX(CASE WHEN unit = 'CS-2' THEN value END) `CS-2`,MAX(CASE WHEN unit = 'CS-3' THEN value END)`CS-3`从(选择单位、月、CASE月当 'JAN' 那么 jan当二月"然后二月当 'MAR' THEN MAR当四月"然后四月当可能"然后可能当'君'那么君结束值FROM table1 t CROSS JOIN(SELECT 'JAN' 月份 UNION ALL选择'FEB'联合所有选择'MAR'联合所有选择'APR'联合所有选择可以"联合所有选择君") C) q按月分组按字段排序(月，'JAN'，'FEB'，'MAR'，'APR'，'MAY'，'JUN')

输出:

这是SQLFiddle 演示

i have problem with transposing row to column and column to row. I can do that if it just transpose row to column or column to row.

This my table with data

UNIT|JAN|FEB|MAR|APR|MEI|JUN
CS-1|100|200|300|400|500|600
CS-2|111|222|333|444|555|666
CS-3|331|123|423|923|918|123

and I would like to get the following output

MONTH|CS-1|CS-2|CS-3
JAN  |100 |111 |331
FEB  |200 |222 |123
MAR  |300 |333 |423

etc..

Anybody know how to do this? Thanks very much!

You can do it this way

SELECT month,
       MAX(CASE WHEN unit = 'CS-1' THEN value END) `CS-1`,
       MAX(CASE WHEN unit = 'CS-2' THEN value END) `CS-2`,
       MAX(CASE WHEN unit = 'CS-3' THEN value END) `CS-3`
  FROM
(
  SELECT unit, month,
         CASE month 
            WHEN 'JAN' THEN jan
            WHEN 'FEB' THEN feb
            WHEN 'MAR' THEN mar
            WHEN 'APR' THEN apr
            WHEN 'MAY' THEN may
            WHEN 'JUN' THEN jun
         END value
    FROM table1 t CROSS JOIN
  (
    SELECT 'JAN' month UNION ALL
    SELECT 'FEB' UNION ALL
    SELECT 'MAR' UNION ALL
    SELECT 'APR' UNION ALL
    SELECT 'MAY' UNION ALL
    SELECT 'JUN'
  ) c
) q
 GROUP BY month
 ORDER BY FIELD(month, 'JAN', 'FEB', 'MAR', 'APR', 'MAY', 'JUN')

Output:

| MONTH | CS-1 | CS-2 | CS-3 |
|-------|------|------|------|
|   JAN |  100 |  111 |  331 |
|   FEB |  200 |  222 |  123 |
|   MAR |  300 |  333 |  423 |
|   APR |  400 |  444 |  923 |
|   MAY |  500 |  555 |  918 |
|   JUN |  600 |  666 |  123 |

Here is SQLFiddle demo

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