How do I return a selected query in PostgreSQL?

How do I return a selected query in PostgreSQL?

To return a table from the function, you use RETURNS TABLE syntax and specify the columns of the table. Each column is separated by a comma (, ). In the function, we return a query that is a result of a SELECT statement.

What is return query in Postgres?

RETURN QUERY appends the results of executing a query to the function’s result set. RETURN NEXT and RETURN QUERY can be freely intermixed in a single set-returning function, in which case their results will be concatenated.

How do I use returning clause in PostgreSQL?

The RETURNING clause is also very useful with INSERT SELECT. If there are triggers (Chapter 36) on the target table, the data available to RETURNING is the row as modified by the triggers. Thus, inspecting columns computed by triggers is another common use-case for RETURNING.

How do I select data in PostgreSQL?

If you want to select data from all the columns of the table, you can use an asterisk ( * ) shorthand instead of specifying all the column names. The select list may also contain expressions or literal values. Second, specify the name of the table from which you want to query data after the FROM keyword.

How do I return multiple result sets in PostgreSQL?

Both stored procedures and user-defined functions are created with CREATE FUNCTION statement in PostgreSQL. To return one or more result sets (cursors in terms of PostgreSQL), you have to use refcursor return type.

How do I return a SQL query?

The RETURN statement is used to unconditionally and immediately terminate an SQL procedure by returning the flow of control to the caller of the stored procedure. It is mandatory that when the RETURN statement is executed that it return an integer value. If the return value is not provided, the default is 0.

What is the return type of select statement in SQL?

The SQL SELECT statement returns a result set of records, from one or more tables. A SELECT statement retrieves zero or more rows from one or more database tables or database views. In most applications, SELECT is the most commonly used data manipulation language (DML) command.

What is returning in SQL?

The RETURN statement is used to unconditionally and immediately terminate an SQL procedure by returning the flow of control to the caller of the stored procedure. It is mandatory that when the RETURN statement is executed that it return an integer value. To return multiple output values, parameters can be used instead.

What does SQL insert return?

An SQL INSERT statement writes new rows of data into a table. If the INSERT activity is successful, it returns the number of rows inserted into the table. If the row already exists, it returns an error.

How do I SELECT a specific column in PostgreSQL?

PostgreSQL – SELECT FROM Table Query

1. PostgreSQL SELECT – All columns and all rows. The syntax of a simple SELECT FROM query is:
2. PostgreSQL SELECT – Only specific columns. To query only specific columns of the table, specify those column names after SELECT keyword.
3. PostgreSQL SELECT – Only first N number of rows.

How do I SELECT all columns in PostgreSQL?

How to list all columns in PostgreSQL?

1. Using SQL query. Using query editor, run this query to show all columns with details: SELECT * FROM information_schema.columns WHERE table_schema = ‘schema_name’ AND table_name = ‘table_name’;
2. Using psql. Using psql, you can use this command: \d+ table_name.
3. Using TablePlus.

What is Refcursor in PostgreSQL?

PostgreSQL provides you with a special type called REFCURSOR to declare a cursor variable. These arguments will be substituted by values when the cursor is opened. After that, you specify a query following the FOR keyword. You can use any valid SELECT statement here.