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why we use subquery in sql

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Handsome Herring answered on December 26, 2020 Popularity 10/10 Helpfulness 2/10

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We use subquery in order to get aggregate value in column without grouping data

Popularity 10/10 Helpfulness 2/10 Language sql

Source: Grepper

Tags: sql subquery

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Contributed on Apr 02 2021

Handsome Herring

0 Answers Avg Quality 2/10

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subquery in sql

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SELECT column_name
 FROM table_name1
WHERE VALUE IN 
(SELECT column_name
FROM table_name2 
WHERE condition)

Popularity 10/10 Helpfulness 4/10 Language sql

Source: Grepper

Tags: sql

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Contributed on Jul 19 2021

Innocent Ibis

0 Answers Avg Quality 2/10

SQL Subquery

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SELECT *
FROM Customers
WHERE age = (
  SELECT MIN(age)
  FROM Customers
);

Popularity 10/10 Helpfulness 3/10 Language sql

Source: Grepper

Tags: sql

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Contributed on May 22 2022

SAMER SAEID

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subquery sql

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-- Simple query with two tables
SELECT left_table.colx, right_table.coly
FROM left_table, right_table
WHERE left_table.common_col = right_table.common_col

-- Subquery inside FROM (turning a query into virtual table using alias, evolving from the previous query)
SELECT left_table.colx, right_table.coly
FROM left_table,
    (SELECT coly, colz, common_col          -- subquery start
    FROM another_table) AS right_table      -- subquery end
WHERE left_table.common_col = right_table.common_col
ORDER BY continent;


-- Subquery inside WHERE (You use it in Semi join / Anti Join)
SELECT left_table.*
FROM left_table
WHERE left_table.some_col <NOT> IN  -- Using "NOT" will result in Anti join
        (                           -- subquery start
            SELECT another_col      
            FROM right_table
        );                          -- subquery end

-- Subquery inside SELECT (REMEMBER: This query should only produce a single value)
SELECT
    outer_table.id,
    (SELECT COUNT(*) FROM inner_table WHERE outer_table.id = inner_table.id) AS new_col_1,              -- subquery 1
    (SELECT AVG(some_column) FROM inner_table WHERE outer_table.id = inner_table.id) AS new_col_2,      -- subquery 2
    (SELECT MAX(another_column) FROM inner_table WHERE outer_table.id = inner_table.id) AS new_col_3    -- subquery 3
FROM
    outer_table;

-- Using the WITH keyword (creating multiple virtual tables)
WITH
result_table1 AS (
    SELECT col1, col2 FROM t1),             -- subquery 1
result_table2 AS (
    SELECT colx, coly FROM t2)              -- subquery 2
SELECT * FROM result_table1, result_table2
WHERE result_table1.col1 <= result_table2.col2

Popularity 9/10 Helpfulness 3/10 Language sql

Source: Grepper

Tags: sql

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Contributed on Jan 28 2023

Innocent Iguana

0 Answers Avg Quality 2/10

what is subquery in sql

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SUBQUERY IS NESTED QUERY INSIDE A SELECT, 
INSERT OR UPDATE METHODS. OR INSIDE ANOTHER SUBQUERY

Popularity 10/10 Helpfulness 2/10 Language sql

Source: Grepper

Tags: sql

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Contributed on Jan 20 2021

Obedient Ocelot

0 Answers Avg Quality 2/10

sql subquery

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SELECT name, listed_price
FROM paintings
WHERE listed_price > (
    SELECT AVG(listed_price)
    FROM paintings
);

Popularity 10/10 Helpfulness 2/10 Language sql

Source: learnsql.com

Tags: sql

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Contributed on Jan 14 2022

Annoying IG

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subquery sql

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UPDATE Book SET note= 'editore: ' + (SELECT name FROM Publisher WHERE Publisher.ID = Book.publisher)

Popularity 10/10 Helpfulness 2/10 Language sql

Source: www.html.it

Tags: sql

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Contributed on Dec 26 2020

abdu

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subquery in sql

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UPDATE dataflair_emp1 
SET salary=35000
WHERE emp_id  = ( SELECT emp_id
                    FROM dataflair_emp1
                    WHERE post='Sr.Manager');     
select * from dataflair_emp1;

Popularity 10/10 Helpfulness 2/10 Language sql

Source: Grepper

Tags: sql

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Contributed on Jul 19 2021

Innocent Ibis

0 Answers Avg Quality 2/10

SQL Subquery

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SELECT incidents.*, sub.incidents AS incidents_that_day
FROM tutorial.sf_crime_incidents_2014_01 incidents
JOIN (
   SELECT date, COUNT(incidnt_num) AS incidents
   FROM tutorial.sf_crime_incidents_2014_01
   GROUP BY 1
) sub ON incidents.date = sub.date
ORDER BY sub.incidents DESC, time;

Popularity 9/10 Helpfulness 1/10 Language typescript

Source: chat.openai.com

Tags: sql subquery subq

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Contributed on Jul 03 2023

amoo hammed

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subquery in sql

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DELETE FROM dataflair_emp1
WHERE emp_id IN ( SELECT emp_id
                   FROM dataflair_emp2
                   WHERE age=25);  
select * from dataflair_emp1;

Popularity 10/10 Helpfulness 1/10 Language sql

Source: Grepper

Tags: sql

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Contributed on Jul 19 2021

Innocent Ibis

0 Answers Avg Quality 2/10

why we use subquery in sql

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