SQLite classic ...login
SQLite classic tutorial
author:php.cn  update time:2022-04-13 17:05:02

SQLiteHaving clause


The HAVING clause allows specifying conditions to filter the grouped results that will appear in the final result.

The WHERE clause sets conditions on the selected columns, while the HAVING clause sets conditions on the grouping created by the GROUP BY clause.

Syntax

The following is the position of the HAVING clause in the SELECT query:

SELECT
FROM
WHERE
GROUP BY
HAVING
ORDER BY

In a query, the HAVING clause must be placed after the GROUP BY clause and before the ORDER BY clause. The following is the syntax of a SELECT statement containing a HAVING clause:

SELECT column1, column2
FROM table1, table2
WHERE [ conditions ]
GROUP BY column1, column2
HAVING [ conditions ]
ORDER BY column1, column2

Example

Assume that the COMPANY table has the following records:

ID                                                                                                                                                                                                                  ID name ------------------------------------------------------------------------------------------------—
1 Paul 32 California 20000.0
2 Allen 25 Texas 15000.0
3 Teddy 23 Norway 20000.0
4 Mark 25 Rich-Mond 65000.0
5 David 27 TEXAS 85000.0
6 Kim 22 South-Hall 45000.0
7 James 10000.0
8 P AUL 24 Houston 20000.0
9 James 44 Norway 5000.0
10 James 45 Texas 5000.0
Here is an example that will display all records with a name count less than 2:

sqlite > SELECT * FROM COMPANY GROUP BY name HAVING count(name) < 2;

This will produce the following results:

ID                                                                                                                                                                                                         ------ ---------- ----------
2 Allen 25 Texas 15000
5 David 27 Texas 85000
6 Kim 22 South- Hall 45000
4 Mark 25 Rich-Mond 65000
3 Teddy 23 Norway 20000
The following is an example. Show all records with name count greater than 2:

sqlite > SELECT * FROM COMPANY GROUP BY name HAVING count(name) > 2;
This will produce the following results:

ID                 NAME       AGE ADDRESS SALARY
---------- ---------- ---------- ---------- ----- -----
10 James 45 Texas 5000


##