Question

如何仅选择查询的前10个结果？

我想只显示以下查询中的前10个结果：

SELECT a.names,
         COUNT(b.post_title) AS num
    FROM wp_celebnames a
    JOIN wp_posts b ON INSTR(b.post_title, a.names) > 0
    WHERE b.post_date > DATE_SUB(CURDATE(), INTERVAL 1 DAY)
GROUP BY a.names
ORDER BY num DESC

Answer 1

在SQL Server中，使用：

select top 10 ...

e.g。

select top 100 * from myTable
select top 100 colA, colB from myTable

在MySQL中，使用：

select ... order by num desc limit 10

Answer 2

取决于您的RDBMS

MS SQL Server

SELECT TOP 10 ...

的MySQL

SELECT ... LIMIT 10

的Sybase

SET ROWCOUNT 10
SELECT ...

等

Answer 3

在MySQL中：

SELECT * FROM `table` LIMIT 0, 10

Answer 4

DB2

... FETCH FIRST 10 ROWS ONLY

Answer 5

的Oracle

WHERE ROWNUM <= 10  and whatever_else ;

ROWNUM是一个神奇的变量，它包含每一行的序列号1 .. n 。

Answer 6

ANSI SQL答案为FETCH FIRST。

SELECT a.names,
         COUNT(b.post_title) AS num
    FROM wp_celebnames a
    JOIN wp_posts b ON INSTR(b.post_title, a.names) > 0
    WHERE b.post_date > DATE_SUB(CURDATE(), INTERVAL 1 DAY)
GROUP BY a.names
ORDER BY num DESC
FETCH FIRST 10 ROWS ONLY

如果您想要包含关系，请改为FETCH FIRST 10 ROWS WITH TIES。

要跳过指定的行数，请使用OFFSET，例如

...
ORDER BY num DESC
OFFSET 20
FETCH FIRST 10 ROWS ONLY

将跳过前20行，然后获取10行。

受更新版本的Oracle，PostgreSQL，MS SQL Server，Mimer SQL和DB2等的支持。

Answer 7

您正在寻找的是LIMIT条款。

SELECT a.names,
         COUNT(b.post_title) AS num
    FROM wp_celebnames a
    JOIN wp_posts b ON INSTR(b.post_title, a.names) > 0
    WHERE b.post_date > DATE_SUB(CURDATE(), INTERVAL 1 DAY)
GROUP BY a.names
ORDER BY num DESC
   LIMIT 10

Answer 8

SELECT *  
  FROM (SELECT ROW_NUMBER () OVER (ORDER BY user_id) user_row_no, a.* FROM temp_emp a)  
 WHERE user_row_no > 1 and user_row_no <11

这对我有用。如果可以的话，我可以查看一些有用的dbscripts

Useful Dbscripts

Answer 9

火鸟：

SELECT FIRST 10 * FROM MYTABLE

Answer 10

<div class="action-bar">
    <a href="" class="btn btn-primary">
        <i class="fa fa-icon"></i> 
        Button label
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    <a href="" class="btn btn-primary">
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</div>

Answer 11

SELECT  Top(12) Month, Year, Code FROM TempEmp 
ORDER BY  Year DESC,month DESC

Answer 12

PostgreSQL：

SELECT ... LIMIT [num] OFFSET [num];

SQL - 仅选择前10行？

12 个答案: