Postgres stating error when performing a subquery error at or near select

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I know this question will be easy for most people. But I really expected that this would work. Why doesn't this query work?

select name, price,  select num from ( select 1 as num) as value 
from products;

I've got this:

error at or near select

You can do it with single SELECT statement :

select name, price, 1 as value 
from products;

Single outer SELECT statement should contains only columns/expressions, if it has other SELECT statements then it should be in subquery form.

something like that :

select t.col1, t.col2 t.col3,
       (select t1.col from table t1 where . . . ) as col_name
from table t;

Documentation: 9.5: SELECT, If RECURSIVE is specified, it allows a SELECT subquery to reference itself by name. while start specifies the number of rows to skip before starting to return rows. With NOWAIT, the statement reports an error, rather than waiting, if a selected row It is possible for a SELECT command running at the READ COMMITTED� This is because commonly you use a sub-select to filter on the primary key. To work around this, you need to manually specify which columns to select in your subquery. When peewee builds the outer query, it uses the alias t1, so you need to specify that as the alias for the sub-select. The following test-case is passing on both sqlite and postgres:

answer depends on what you want to do exactly.

remember that select 1 from table is a correct sql query, which returns "the first column" from the table

it explains why you have a syntax error in your query. the from table is missing in your (select 1 as num)

so let's confirm what your want exactly

U115: Subquery in FROM must have an alias � pganalyze, Example Postgres Log Output: ERROR: subquery in FROM must have an alias at character 15 HINT: For example, FROM (SELECT ) [AS] foo. STATEMENT:� The WITH clause allows you to specify one or more subqueries that can be referenced by name in the primary query. The subqueries effectively act as temporary tables or views for the duration of the primary query. Each subquery can be a SELECT, VALUES, INSERT, UPDATE or DELETE statement.

Why does this fail?

select name, price,  select num from ( select 1 as num) as value 
from products;

select is a SQL keyword that indicates either a new query or a subquery. When used with a subquery, it must be preceded by its own parentheses. Hence, you get a syntax error.

If you add the parentheses:

select name, price,  (select num from ( select 1 as num)) as value 
from products;

You will get a different error, because the nested subquery is missing a table alias.

In the end, you can fix this to what you presumably intend:

select p.name, p.price, (select num from (select 1 as num) x) as value from products p;

Exploring subqueries in PostgreSQL — Column names and , There is an old saying that there is more than one way to skin a cat. Fear not, I ERROR: more than one row returned by a subquery used as an expression ( See Chapter 7 for information about writing queries.) By not filtering with the WHERE clause in the subquery, the SELECT statement is doing this: Subqueries can be used in different ways and at different locations inside a query: Here is a subquery with the IN operator. SELECT column-names FROM table-name1 WHERE value IN (SELECT column-name FROM table-name2 WHERE condition)

SQL Intermediate: PostgreSQL, Subqueries, and more! – Dataquest, Today, we're going to perform data discovery and analysis on two data sets then don't have to worry about passwords or specifying a user moving forward. account database (if we don't specify a database here, we'll get an error). query = ''' SELECT count(*) FROM credit_card_complaints WHERE� Following 4 methods to select rows that are not present in other tables, all of them are standard SQL. 1. NOT EXISTS. For more information refer to this link:

My Favorite PostgreSQL Queries and Why They Matter, Suppose in this example, we have a running sale of two months and are getting a total of both ERROR: subquery has too many columns. PostgreSQL 10.4; Subqueries are a special type of SELECT statement. They can be used for the target columns of your SELECT clauses, even if the table that subquery derives from is not named in the FROM clause. Oftentimes they are used as part of predicate filters in WHERE clauses but that topic is for another blog post. All in all, they are

postgres=# \c testdb; psql (9.2.4) Type "help" for help. You are now connected to database "testdb" as user "postgres". testdb=# In the above command, we are connecting to the testdb database. For the UI part of PostgreSQL, we will be using pgAdmin, for selecting any database in pgAdmin, just double click on the database.