1, the copy of the table
Syntax format:
CREATE TABLE 表名 AS SELECT 语句;It means that the query result of the following select is used as a new table to be copied and created
Example 1: Copy all fields of the query result
Create a new table called t_testtable_001, this table is created by copying the query result of the following select * from t_testtable as a table,
Among them: t_testtable This table is detailed in lesson 011: https://blog.csdn.net/weixin_43184774/article/details/115085959
create table t_testtable_001 as select * from t_testtable;
Example 2: Copy some fields of the query result
Create a new table t_testtable_002, this new table is composed of the following t_testtable table, according to the name, classno, birth field copy
Among them: t_testtable This table is detailed in lesson 011: https://blog.csdn.net/weixin_43184774/article/details/115085959
create table t_testtable_002 as select name,classno,birth from t_testtable;
2, the insertion of the table
Example: Put the query result in and out of a new table
Insert the query result of select * from t_testtable into the t_testtable_001 table
insert into t_testtable_001 select * from t_testtable;