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SQLite HAVING 子句

The HAVING clause allows you to specify conditions to filter which group results appear in the final results.

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

Syntax

Here is the position of the HAVING clause in the SELECT query.

SELECT
FROM
WHERE
GROUP BY
HAVING
ORDER BY

The HAVING clause must come after the GROUP BY clause in the query, and if used, it must also come before the ORDER BY clause. Here is the syntax of the SELECT statement including the HAVING clause.

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

Online example

Consider the COMPANY table with the following records.

ID          NAME        AGE         ADDRESS     SALARY
----------  ----------  ----------  ----------  ----------
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       24          Houston     10000.0
8           Paul        24          Houston     20000.0
9           James       44          Norway      5000.0
10          James       45          Texas       5000.0

Di seguito è riportato un esempio che mostrerà le registrazioni con il conteggio dei nomi minore di 2.

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

这将产生以下结果。

ID          NAME        AGE         ADDRESS     SALARY
----------  ----------  ----------  ----------  ----------
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

Di seguito è riportato un esempio che mostrerà le registrazioni con il conteggio dei nomi maggiore di 2.

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

这将产生以下结果。

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