sqlite

database; ??? ??? ??????

having

English ['h?v?y?]

n. Have(have? ?? ??) ; ?? ????) ??

SQLiteHaving?? ???

Role: HAVING ?? ???? ?? ??? ??? ???? ??? ????? ??? ??? ? ????.

WHERE ?? ??? ?? ?? ??? ????, HAVING ?? GROUP BY ?? ?? ??? ???? ?? ??? ?????.

??: ????? SELECT ???? HAVING ?? ?????.

SELECT
FROM
WHERE
GROUP BY
HAVING
ORDER BY

???? HAVING ?? GROUP? ????? ???. BY ? ???? ORDER BY ? ?? ?? ???. HAVING ?? ??? SELECT ?? ??? ??? ????.

SELECT column1, column2
FROM table1, table2
WHERE [??]
GROUP BY ??1, ??2
HAVING [??]
ORDER BY ??1, ??2

SQLiteHaving?? ?

 COMPANY 表有以下記錄：

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
下面是一個實例，它將顯示名稱計數(shù)小于 2 的所有記錄：

sqlite > SELECT * FROM COMPANY GROUP BY name HAVING count(name) < 2;
這將產(chǎn)生以下結(jié)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
下面是一個實例，它將顯示名稱計數(shù)大于 2 的所有記錄：

sqlite > SELECT * FROM COMPANY GROUP BY name HAVING count(name) > 2;
這將產(chǎn)生以下結(jié)果：

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