问题
What's the equivalent to SQL Server's TOP
or DB2's FETCH FIRST
or mySQL's LIMIT
in PostgreSQL?
回答1:
You can use LIMIT just like in MySQL, for example:
SELECT * FROM users LIMIT 5;
回答2:
You could always add the OFFSET
clause along with LIMIT
clause.
You may need to pick up a set of records from a particular offset. Here is an example which picks up 3 records starting from 3rd position:
testdb=# SELECT * FROM COMPANY LIMIT 3 OFFSET 2;
This would produce the following result:
id | name | age | address | salary
----+-------+-----+-----------+--------
3 | Teddy | 23 | Norway | 20000
4 | Mark | 25 | Rich-Mond | 65000
5 | David | 27 | Texas | 85000
Full explanation and more examples check HERE
回答3:
Use the LIMIT clause or FETCH FIRST 10 ROWS
回答4:
Apart from limit you could use Fetch First as well. Your question already had the answer
Select * from users FETCH FIRST 5 ROWS ONLY
回答5:
On PostgreSQL, there are two ways to achieve this goal.
SQL Standard
The first option is to use the SQL:2008 standard way of limiting a result set using the FETCH FIRST N ROWS ONLY
syntax:
SELECT
title
FROM
post
ORDER BY
id DESC
FETCH FIRST 50 ROWS ONLY
The SQL:2008 standard syntax is supported since PostgreSQL 8.4.
PostgreSQL 8.3 or older
For PostgreSQL 8.3 or older versions, you need to the LIMIT clause to restrict the result set size:
SELECT
title
FROM
post
ORDER BY
id DESC
LIMIT 50
For more details about this topic, check out this article.
来源:https://stackoverflow.com/questions/1133944/how-to-limit-rows-in-postgresql-select