mysql - 如何从表中选择最新行

Question

我有表1

table1
id          int
myvalue     text
datevalue   datetime ('2016-02-23 19:25:02')

和表2

table2
id          int
myvalue     text
datevalue   datetime ('2016-02-23 19:27:58')

我想为 table1 和 table2 选择最近的 5 行

我猜这是一个 ORDER BY datevalue DESC LIMIT 5 ...

但是我尝试了很多方法都没有成功!

谢谢:)

Answer 1

对于两个表一起:

SELECT * FROM (
    SELECT * FROM Table1
    UNION ALL
    SELECT * FROM Table2)
ORDER BY datevalue desc LIMIT 5

对于每个表分别:

  SELECT * FROM Table1
   ORDER BY datevalue desc LIMIT 5
  UNION ALL
  SELECT * FROM Table2
   ORDER BY datevalue desc LIMIT 5