![]() ![]() Move forward and you will have detailed knowledge about the PostgreSQL SELECT statement. ![]() All of these functions may be used only by superusers. You can consider the SELECT statement to be the most complex statement in PostgreSQL that can be used with a variety of optional keywords and clauses. You can also use row and column aliases with a SET clause, as. The pageinspect module provides functions that allow you to inspect the contents of database pages at a low level, which is useful for debugging purposes. You can read more about SELECT INTO – copying data into new table and INSERT INTO – copying data into existing table. INSERT INTO t1 SELECT FROM (SELECT c, c+d AS e FROM t2) AS dt ON DUPLICATE KEY UPDATE b e. Which one to use between SELECT INTO and INSERT INTO? SELECT INTO creates a new table while INSERT INTO does NOT. For INSERT INTO, the table must exist else you need to create it. The new table will have columns with the names. INTO newtable is valid PostgreSQL, its use has been deprecated (or, at least, unrecommended). The Difference between SELECT INTO and INSERT INTO The PostgreSQL SELECT INTO statement creates a new table and inserts data returned from a query into the table. SELECT customer_name, location FROM customers INSERT INTO Examples INSERT INTO users (user_name, location) Insert data from one table into another for specific columns, INSERT INTO table2 Insert data from one table into another for all columns, INSERT INTO table2 What is the difference between using SELECT INTO and INSERT INTO? Both can be used to copy data from one table into anotherĬopy all columns into new table in same database: SELECT *Ĭopy only the columns we want into the new table in same database: SELECT column_name1,column_name2.Ĭreate a backup copy of Customers: SELECT *Ĭopy only a few columns into the new table: SELECT User_Name, User_Contact ![]()
0 Comments
Leave a Reply. |