SUB-QUERIES

15 pts.
Tags:
SQL Server
Subquery
Hi, Good you give me an best real example for using the sub query, correlation of sub query & Top analysis using subqueries. Thanks in Advance.................

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Subqueries in Oracle SQL

sample uncorrelated subquery (team which has the most wins) —

SELECT teamname FROM teams
WHERE wins = ( SELECT MAX(wins) FROM teams )

sample correlated subquery ( players who scored most goals on their teams) —

SELECT playername FROM players AS p
WHERE goals = ( SELECT MAX(goals) FROM players WHERE teamid = p.teamid )

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  • danieljones

    we have 2 numeral fields in a table "user": leg_count and leg_length. The first one stores the amount of legs of a user and the second one stores their total length.

    WITH stats AS

       ( SELECT COUNT(*)    AS cnt

              , SUM(length) AS totlength

              , user_id

           FROM legs

          GROUP BY user_id

       )

    UPDATE users

       SET leg_count = cnt, leg_length = totlength

      FROM stats

     WHERE stats.user_id = users.id

    2,800 pointsBadges:
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