SQL exercises

June 26, 06:42 MSK

SQL Exercises is intended for acquiring good practical experience, which is focused on data operation, namely on SQL DML. Certain exercises for beginners are provided on the site, they are supplied with the necessary reference source on SQL syntax with a great number of examples. Apart from them, 3 rating stages are suggested, they are aimed at testing of specialists and their certification. The source is absolutely free of charge, and the certificate purchase has a voluntary basis.
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Ratings

  • Top 100
  • Top 100 on latest exercises
  • "Liberal" rating
  • Olympic rating
  • TOP 100 of Learning Stage
  • Rating by summation of ranks
  • Top 10 (photos)
  • Last-week results
  • Rating of second-stage exercises (average)
  • Rating of 2nd-stage exercises (median)
  • Author's rating  • 2nd stage rating up to exercise:
   enter No 
  • Rating on the exercise:
   enter No
  • Optimistic rating
   enter factor

Statistics

  • Today statistics
  • Site's old residents
  • Recent leaders activity
  • Сhanges in exercises' TOP 10
  • Results' chart

SQL exercises

  • SELECT (learning stage)
  • SELECT (learning stage,
      choosing DBMS)
  • SELECT (rating stages)
  • DML 
  • Modelling of data
  • Visual modelling (painting)
  • Exercises voting

Forums

  • Learning stage
  • Rating stages
  • Favorites
  • Search

Certification

  • About certification
  • The first certificate in SQL
  • Certified professionals
  • Statistics
  • Statistics over regions (map)
  • Confirm certificate

HELP

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Comparative graphs of solution's time and queries' performance on cost's estimation of the performance's plan (SELECT)

To add the graph of the participant, enter his nickname and press the button "+" (the maximum of 5 participants is allowed). Then rebuild graphs with help of the "GO" button.
To clear the list of participants, press button "CLEAR". After changing the parametrs (such as scale's type and number of points on graph) press button "GO" to rebuild the graph.

Add nickname to the list:

Participant list

Detailed navigation:

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By solution's time
By estimated cost

Show the graph of average rating

Show the graph of minimal cost

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