SQLite Having 子句
HAVING 子句允許指定條件來篩選將出現在最終結果中的分組結果。
WHERE 子句在所選列上設定條件，而 HAVING 子句則在 GROUP BY 子句建立的分組上設定條件。
語法
下面是HAVING 子句在SELECT 查詢中的位置：
SELECT
FROM
WHERE
GROUP BY
HAVING
ORDER BY
FROM
WHERE
GROUP BY
HAVING
ORDER BY
在一個查詢中，HAVING 子句必須放在GROUP BY 子句之後，必須放在ORDER BY 子句之前。以下是包含HAVING 子句的SELECT 語句的語法：
SELECT column1, column2
FROM table1, table2
WHERE [ conditions ]lum #UP BY column1, HAVING [ conditions ]
ORDER BY column1, column2
#10 James 45 Texas #1
FROM table1, table2
WHERE [ conditions ]lum #UP BY column1, HAVING [ conditions ]
ORDER BY column1, column2
#
實例
假設COMPANY 表有以下記錄：
ID NAME AGE ---- ---------- ---------- ----------
1 Paul 32 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 James 45 Texas 5000.0
1 Paul 32 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 James 45 Texas 5000.0
#12的所有記錄名稱》 ##sqlite > SELECT * FROM COMPANY GROUP BY name HAVING count(name) < 2;
###這將產生以下結果：
ID NAME AGE ------ ---------- ----------
2 Allen 25 David 27 Texas 855000
6 South- Hall 45000
4 Mark 25 23 Norway ‧
#sqlite > SELECT * FROM COMPANY GROUP BY name HAVING count(name) > 2;
# ADDRESS SALARY
---------- ---------- ---------- ---------- ----- -----2 Allen 25 David 27 Texas 855000
6 South- Hall 45000
4 Mark 25 23 Norway ‧
#sqlite > SELECT * FROM COMPANY GROUP BY name HAVING count(name) > 2;
# ADDRESS SALARY
