Re: Insert into table from another table if not exist Gideon Engelbrecht June 01, 2021 12:39AM Sorry, you can't reply to this topic. It has been closed. This forum is currently read only. You can not log in or make any changes. This is a temporary situation. ...
在MySQL中,我们可以使用INSERT INTO语句将查询结果插入到另一个表中。其基本语法如下: INSERTINTOtable_name(column1,column2,column3,...)SELECTcolumn1,column2,column3,...FROManother_tableWHEREcondition; 1. 2. 3. 4. INSERT INTO table_name:指定要插入数据的目标表。 (column1, column2, column3, ....
INSERT INTO table_name (column1, column2, column3, ...) SELECT column1, column2, column3, ... FROM another_table WHERE condition; 将table1中的数据插入到table2中: INSERT INTO table2 (field1, field2) SELECT col1, col2 FROM table1; 批量插入 批量插入是一种高效的方法,特别适用于需要插...
在进行根据条件插入数据时,我们可以使用INSERT INTO语句搭配条件语句,来实现按条件插入数据的操作。下面是一个示例: AI检测代码解析 INSERTINTOtable_name(column1,column2,...)SELECTvalue1,value2,...FROManother_tableWHEREcondition; 1. 2. 3. 4.
INSERT INTO table_name(column_list) SELECT select_list FROM another_table WHERE condition; INSERT ON DUPLICATE KEY UPDATE statement(插入更新数据)如果目标表里已经存在相同的主键,则执行下面的更新字段的SQLINSERT INTO table (column_list) VALUES (value_list) [SELECT ...FROM ... WHERE] ON DUPLICATE ...
⑥.修改列名(必须带上参数):mysql> alter table <table> change <old field> <new field> <type> [other]; 4.批量导出数据: 从同一数据库导入:INSERT INTO <table> SELECT field1,field2,field2,..., FROM <another table>; 从不同数据库导入:INSERT INTO <database.table> SELECT field1,field2,fie...
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INSERTINTOtable_name(column1,column2,column3)SELECTvalue1,value2,value3FROManother_tableWHEREcondition; 在上述示例中,table_name是要插入数据的表名,column1、column2和column3是要插入的列名,value1、value2和value3是子查询返回的值,another_table是包含要插入的值的另一个表,condition是一个可选的条件...
as a foreign key in another table. 4. MySQL 8 新特性:计算列 什么叫计算列呢?简单来说就是某一列的值是通过别的列计算得来的。例如,a列值为 1 、b列值为 2 ,c列不需要手动插入,定义a+b的结果为c的值,那么c就是计算列,是通过别的列计算得来的。 在MySQL 8.0中,CREATE TABLE 和 ALTER TABLE 中...
If they're PKs, it's redundant to also declare them unique. To see what's going on, run the SEELCT portion of that query by itself. Subject Written By Posted Insert into table from another table if not exist Gideon Engelbrecht