#Postgresql insert into select and values full#
This provides the full power of the SQL query mechanism ( Chapter 7) for computing the rows to be inserted. SELECT product_no, name, price FROM new_products
INSERT INTO products (product_no, name, price) It is also possible to insert the result of a query (which might be no rows, one row, or many rows): INSERT INTO products (product_no, name, price) VALUES You can insert multiple rows in a single command: INSERT INTO products (product_no, name, price) VALUES (1, 'Cheese', DEFAULT) It fills the columns from the left with as many values as are given, and the rest will be defaulted.įor clarity, you can also request default values explicitly, for individual columns or for the entire row: The second form is a PostgreSQL extension. INSERT INTO products VALUES (1, 'Cheese') INSERT INTO products (product_no, name) VALUES (1, 'Cheese') In that case, the columns will be filled with their default values. If you don't have values for all the columns, you can omit some of them. Many users consider it good practice to always list the column names. INSERT INTO products (name, price, product_no) VALUES ('Cheese', 9.99, 1) INSERT INTO products (product_no, name, price) VALUES (1, 'Cheese', 9.99) For example, both of the following commands have the same effect as the one above: To avoid this you can also list the columns explicitly. The above syntax has the drawback that you need to know the order of the columns in the table. Usually, the data values will be literals (constants), but scalar expressions are also allowed. The data values are listed in the order in which the columns appear in the table, separated by commas. INSERT INTO products VALUES (1, 'Cheese', 9.99)
For example, consider the products table from Chapter 5:Īn example command to insert a row would be: The command requires the table name and column values. To create a new row, use the INSERT command. Even if you know only some column values, a complete row must be created. INSERT into foobar (fooid, barid) VALUES ( (select id from foo where name 'selena'), (select id from bar where type 'name')) INSERT into foobar (fooid, barid) VALUES ( (select id from foo where name 'funny'), (select id from bar where type 'name')) INSERT into foobar (fooid, barid) VALUES ( (select id from foo where name 'ch. In the attempts below, I was successful by explicitly retrieving the sequence but I am hoping there is a way to either INSERT using the DEFAULT values. You can also insert more than one row in a single command, but it is not possible to insert something that is not a complete row. Is it possible to INSERT values into a PostgreSQL table from a SELECT statement and to use DEFAULT values for the columns that are null In my case, the SELECT statement is selecting from JSON. The first thing to do before a database can be of much use is to insert data. When a table is created, it contains no data.
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