Select INTO INSERT into Select two table copy statement

Insert is a common statement in T-SQL, insert into table (Field1,field2,...) VALUES (value1,value2,...) This form is essential in application development. But in our development, testing process, we often encounter situations that require table replication, such as copying part of a Table1 data to table2, or copying the entire table1 to table2, when we use SELECT INTO and INSERT into The SELECT table replicates the statement.

1.INSERT into SELECT statement

Statement form: Insert into Table2 (field1,field2,...) Select Value1,value2,... from Table1

The target table Table2 must exist, and because the target table Table2 already exists, we can insert a constant in addition to the fields Table1 the source table. Examples are as follows: INSERT into SELECT statement Copy table data

2.SELECT into from statement

Statement form: SELECT vale1, value2 into Table2 from Table1

The target table Table2 does not exist because the table Table2 is created automatically at insert time and the specified field data in Table1 is copied to Table2. Examples are as follows: SELECT into from to create a table and copy table data