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What's the equivalent to SQL Server's TOP or DB2's FETCH FIRST or mySQL's LIMIT in PostgreSQL?
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To limit rows in the result set, use ORDER BY with the optional OFFSET and FETCH clauses. First, the query sorts the rows (ORDER BY). You then tell SQL Server which should be the first row in the result set (OFFSET...
LIMIT and OFFSET are used when you want to retrieve only a few records from your result of query. LIMIT will retrieve only the number of records specified after the LIMIT keyword, unless the query itself returns fewer records than the number specified by LIMIT.
If a limit count is given, no more than that many rows will be returned (but possibly fewer, if the query itself yields fewer rows). LIMIT ALL is the same as omitting the LIMIT clause, as is LIMIT with a NULL argument. OFFSET says to skip that many rows before beginning to return rows.
PostgreSQL LIMIT is an optional clause of the SELECT statement that constrains the number of rows returned by the query. The statement returns row_count rows generated by the query. If row_count is zero, the query returns an empty set.
You can use LIMIT just like in MySQL, for example:
SELECT * FROM users LIMIT 5; 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
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