mysql - 多个查询合而为一？

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、每年的20条记录。

Answer 1

您可以使用 UNION 合并结果集这样:

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