SQLiteHavingfunctions
Translation results：
sqlite
Database; use; embedded relational database
having
英['hævɪŋ] 美[ 'hævɪŋ]
n. All, hold
v. Have (present participle of have); (in kinship relationship) accept; take; buy
SQLiteHavingfunctionssyntax
Function: The HAVING clause allows you to specify 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
SQLiteHavingfunctionsexample
COMPANY 表有以下记录： 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 下面是一个实例，它将显示名称计数小于 2 的所有记录： 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 下面是一个实例，它将显示名称计数大于 2 的所有记录： 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