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In PostgreSQL limit The clause is used to limit the number of data queried in the SELECT statement.
The basic syntax of a SELECT statement with LIMIT clause is as follows:
SELECT column1, column2, columnN FROM table_name LIMIT [no of rows]
The syntax when using LIMIT clause and OFFSET clause together is as follows:
SELECT column1, column2, columnN FROM table_name LIMIT [no of rows] OFFSET [row num]
Create COMPANY table(Download COMPANY SQL file ),data content as follows:
w3codeboxdb# select * from COMPANY; id | name | age | address | salary ----+-------+-----+-----------+-------- 1 | Paul | 32 | California| 20000 2 | Allen | 25 | Texas | 15000 3 | Teddy | 23 | Norway | 20000 4 | Mark | 25 | Rich-Mond | 65000 5 | David | 27 | Texas | 85000 6 | Kim | 22 | South-Hall| 45000 7 | James | 24 | Houston | 10000 (7 rows)
The following example will find a specified number of data, that is, read 4 data items:
w3codeboxdb=# SELECT * FROM COMPANY LIMIT 4;
Get the following result:
id | name | age | address | salary ----+-------+-----+-------------+-------- 1 | Paul | 32 | California | 20000 2 | Allen | 25 | Texas | 15000 3 | Teddy | 23 | Norway | 20000 4 | Mark | 25 | Rich-Mond | 65000 (4 rows)
However, in some cases, it may be necessary to extract records starting from a specific offset.
The following example extracts starting from the third position 3 number of records:
w3codeboxdb=# SELECT * FROM COMPANY LIMIT 3 OFFSET 2;
Get the following result:
id | name | age | address | salary ----+-------+-----+-----------+-------- 3 | Teddy | 23 | Norway | 20000 4 | Mark | 25 | Rich-Mond | 65000 5 | David | 27 | Texas | 85000 (3 rows)