是一种常见的数据库操作,用于合并两个查询的结果集。
示例代码:
SELECT column1, column2 FROM table1
UNION
SELECT column1, column2 FROM table2;
示例代码:
SELECT column1, column2 FROM table1
INNER JOIN table2 ON table1.column = table2.column;
示例代码:
SELECT column1, column2 FROM table1
LEFT JOIN table2 ON table1.column = table2.column;
示例代码:
SELECT column1, column2 FROM table1
CROSS JOIN table2;
应用场景:
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