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我正在将一些现有查询转换为推进 ORM。现在我坚持在推进中转换以下类似的查询。
(SELECT name,address,phone FROM table_1) UNION (SELECT name,address,phone FROM table_2) UNION (SELECT name,address,phone FROM table_3)
上述查询的正确推进实现是什么?
这是一个相当复杂的查询,您最好从选择中创建一个视图,然后在您的 xml 模式中创建一个具有相同列的只读表。它具有相同的行为。
<table name="my_table" readOnly="true">