insert into select union all

INSERT INTO语句用于将数据插入到表中，而SELECT语句用于从表中选取数据。UNION ALL操作符可以将两个或多个SELECT语句的结果合并成一个结果集，并允许重复的值。所以，"insert into select union all"的作用是将两个SELECT语句的结果合并后插入到表中，允许结果中出现重复的值。例如，可以使用以下语法来实现这个目的：

INSERT INTO 表名 (列1, 列2, 列3, ...)
SELECT 列1, 列2, 列3, ...
FROM 表1
UNION ALL
SELECT 列1, 列2, 列3, ...
FROM 表2;

其中，表名是要插入数据的目标表，列1、列2、列3等是目标表中要插入数据的列，表1和表2是要从中选取数据的源表。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* *2* [2014-4-8-解决insert into select union插入多行只显示1行受影响](https://blog.csdn.net/LuckeyZhang/article/details/23196307)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT0_1"}}] [.reference_item style="max-width: 50%"]
- *3* [十一 SQL UNION 与 SELECT INTO 与 INSERT INTO SELECT](https://blog.csdn.net/W_H_M_2018/article/details/103414860)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT0_1"}}] [.reference_item style="max-width: 50%"]
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