Question

任何人都可以帮我写下面的SQL吗？

假设：

tbl_request

No       Title       Date           Priority
1        AAA         2013-08-06     3
2        BBB         2013-08-04     1
3        CCC         2013-08-05     0
4        DDD         2013-08-02     4
5        EEE         2013-08-01     2
6        FFF         2013-08-04     0
7        GGG         2013-08-03     5
8        HHH         2013-08-03     0

在sql语句中有两个要优先考虑的优先级：

第一优先级：按升序优先顺序排序（仅限1,2,3,4,5）
第二优先：按日期降序排序

我想先显示第一个优先顺序的所有请求（0不会显示）。在第一优先级之后，我想显示第二优先级。

这就是我想要的：

No       Title       Date           Priority
2        BBB         2013-08-04     1
5        EEE         2013-08-01     2
1        AAA         2013-08-06     3
4        DDD         2013-08-02     4
7        GGG         2013-08-03     5
3        FFF         2013-08-05     0
6        GGG         2013-08-04     0
8        HHH         2013-08-03     0

我不知道如何编写sql语句来获取上面的格式。谁能告诉我怎么写呢？

提前感谢。

Answer 1

像

这样的东西

SELECT *
FROM Table1
ORDER BY 
  CASE WHEN `Priority` != 0 THEN NULL ELSE 1 END,
  `Priority`,
  `Date` DESC

或

SELECT *
FROM Table1
ORDER BY 
  CASE WHEN `Priority` != 0 THEN 0 ELSE 1 END,
  `Priority`,
  `Date` DESC

SQL Fiddle DEMO

这将确保即使任何优先级大于其他优先级的最大值，也会将0排在最后。

Answer 2

您应该使用case表达式，如下所示

select No,Title,Date,Priority
from tab
order by 
  case
     when Priority=0 then 9999
     else Priority
  end,
  Date desc

Answer 3

您可以尝试以下方式： -

SELECT * FROM tbl_request
    WHERE Priority IN (1, 2, 3, 4, 5)
    ORDER BY Priority, DATE DESC
UNION
SELECT * FROM tbl_request
    WHERE Priority NOT IN (1, 2, 3, 4, 5)
    ORDER BY Date DESC;

Answer 4

select no,title,date,priority
from tbl_request
order by if(priority=0,99999,priority),date desc

这假设没有优先级超过99999.哟还需要在no和date列周围找回引号 - 我没有在这个键盘上使用它们！

Answer 5

如果您没有显示0优先级记录，那么下面的SQL语句就可以了。

SELECT * FROM tbl_request WHERE Priority <> 0 ORDER BY Priority ASC, Date DESC

Answer 6

Select * from tbl_request 
Order by ( CASE WHEN Priority > 0 THEN Priority ELSE 99999999 END ), DATE DESC

Answer 7

您可以尝试：

Select title, date, priority from tbl_request Order By IF(priority = 0, 99999, priority) asc, date desc

虽然它很丑陋，效率低下，但对你有用。或者您可以考虑建立子查询的联合

Select title, date, priority from tbl_request where priority > 0 order by priority asc
union
Select title, date, priority from tbl_request where priority = 0 order by date desc

Answer 8

SELECT *
FROM Table1
ORDER BY 
  (CASE WHEN Priority = 0 THEN  9999 ELSE 1 END)  asc, date desc

Answer 9

SELECT *
FROM Table1
ORDER BY field(`Priority`,0),`Priority`,
  `Date` DESC

<强> FIDDLE

任何人都可以帮我写sql语句吗？

9 个答案:

SQL Fiddle DEMO