SQL IN 運(yùn)算符
IN 運(yùn)算符允許您在 WHERE 子句中指定多個(gè)值。
IN 運(yùn)算符是多個(gè) OR 條件的簡(jiǎn)寫。
SQL IN 語法
SELECT column_name(s)
FROM table_name
WHERE column_name IN (value1, value2, ...);
或者
SELECT column_name(s)
FROM table_name
WHERE column_name IN (SELECT STATEMENT);
演示數(shù)據(jù)庫
在本教程中,我們將使用著名的 Northwind 示例數(shù)據(jù)庫。
以下數(shù)據(jù)選取自"Customers" 表:
CustomerID | CustomerName | ContactName | Address | City | PostalCode | Country |
---|---|---|---|---|---|---|
1
|
Alfreds Futterkiste | Maria Anders | Obere Str. 57 | Berlin | 12209 | Germany |
2 | Ana Trujillo Emparedados y helados | Ana Trujillo | Avda. de la Constitución 2222 | México D.F. | 05021 | Mexico |
3 | Antonio Moreno Taquería | Antonio Moreno | Mataderos 2312 | México D.F. | 05023 | Mexico |
4
|
Around the Horn | Thomas Hardy | 120 Hanover Sq. | London | WA1 1DP | UK |
5 | Berglunds snabbk?p | Christina Berglund | Berguvsv?gen 8 | Lule? | S-958 22 | Sweden |
IN 操作符實(shí)例
以下 SQL 語句選取位于“Germany”,“France”和“UK”的所有客戶:
代碼示例:
SELECT * FROM Customers
WHERE Country IN ('Germany', 'France', 'UK');
以下 SQL 語句選取不在“Germany”,“France”或“UK”中的所有客戶:
代碼示例:
SELECT * FROM Customers
WHERE Country NOT IN ('Germany', 'France', 'UK');
以下 SQL 語句選取來自同一國家的所有客戶作為供應(yīng)商:
代碼示例:
SELECT * FROM Customers
WHERE Country IN (SELECT Country FROM Suppliers);
更多建議: