oracle常用经典SQL查询有哪些

2023-04-10 14:21:00 常用 有哪些 经典
常用经典SQL查询包括: 1.查询指定表中的所有记录: SELECT * FROM table_name; 2.查询指定表中的特定字段: SELECT field1, field2, field3 FROM table_name; 3.根据条件查询指定表中的记录: SELECT * FROM table_name WHERE condition; 4.对查询结果排序: SELECT * FROM table_name ORDER BY field1, field2; 5.分组查询: SELECT * FROM table_name GROUP BY field1, field2; 6.连接查询: SELECT * FROM table_name1, table_name2 WHERE table_name1.field1 = table_name2.field2; 7.子查询: SELECT * FROM table_name WHERE field1 IN (SELECT field1 FROM table_name2);

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