mysql - 多个查询合二为一？

Question

如何将其放入一个查询中？

例如：

SELECT * FROM `result` WHERE status = 'new' AND YEAR(`end_date`)  = '2012' limit 20
SELECT * FROM `result` WHERE status = 'new' AND YEAR(`end_date`)  = '2013' limit 20
SELECT * FROM `result` WHERE status = 'new' AND YEAR(`end_date`)  = '2014' limit 20
SELECT * FROM `result` WHERE status = 'new' AND YEAR(`end_date`)  = '2015' limit 20

SELECT * FROM `result` WHERE status = 'new' AND DAY(`end_date`)  = '1' limit 20
SELECT * FROM `result` WHERE status = 'new' AND DAY(`end_date`)  = '2' limit 20
... and to 31

and same for the Month Jan to Dec

基本上显示每天、每月和每年的 20 条记录。

Answer 1

您可以通过这种方式使用UNION合并结果集：

SELECT * FROM `result` WHERE status = 'new' AND YEAR(`end_date`)  = '2012' limit 20
UNION
SELECT * FROM `result` WHERE status = 'new' AND YEAR(`end_date`)  = '2013' limit 20
UNION
SELECT * FROM `result` WHERE status = 'new' AND YEAR(`end_date`)  = '2014' limit 20
UNION
SELECT * FROM `result` WHERE status = 'new' AND YEAR(`end_date`)  = '2015' limit 20
UNION
SELECT * FROM `result` WHERE status = 'new' AND DAY(`end_date`)  = '1' limit 20
UNION 
SELECT * FROM `result` WHERE status = 'new' AND DAY(`end_date`)  = '2' limit 20
ORDER BY submit_date DESC

Answer 2

我认为您需要使用存储功能，而不是类似的东西可能会帮助您

create function MyRecords()
RETURNS @MyResultsTable table
BEGIN
    select * into @MyResultsTable from ? where ?
    select * into @MyResultsTable from ? where ?
    select * into @MyResultsTable from ? where ?
    select * into @MyResultsTable from ? where ?
    .....
    .....
    .....
end

我现在没有安装 MySql，但你应该尝试从控制台创建它并调用它。祝你好运！

Answer 3

SELECT * FROM `result` WHERE status = 'new' AND YEAR(`end_date`)  >= '2012' AND YEAR(`end_date`) <= '2015' AND DAY(`end_date`)  >= '1' AND DAY(`end_date`)  <= '32' AND  MONTH(`end_date`)  >= '1' AND  MONTH(`end_date`)  <= '12'  limit 20

这样做，你想要什么？