postgresqlHow do I use a SELECT statement to update a PostgreSQL table?

To update a PostgreSQL table using a SELECT statement, you must use the UPDATE command. The syntax is as follows:

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

For example, if you wanted to update the name column of the users table to John for all records with an id of 1, you could use the following query:

UPDATE users
SET name = 'John'
WHERE id = 1;

This would update the name column of the users table to John for all records with an id of 1.

The parts of this query are as follows:

• UPDATE - the keyword used to inform the database that the query will be an update query
• users - the name of the table to be updated
• SET - the keyword used to inform the database of the columns and values to be updated
• name = 'John' - the column and value to be updated
• WHERE - the keyword used to inform the database of the condition that must be met in order for the update to take place
• id = 1 - the condition that must be met in order for the update to take place

For more information on the UPDATE statement, see the PostgreSQL Documentation.

Edit this code on GitHub