SQL exercises
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January 05, 17:10 MSK ???-100
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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Top 100Top 100 on latest exercises"Liberal" ratingOlympic ratingTOP 100 of Learning StageRating by summation of ranksTop 10 (photos)Last-week resultsRating 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
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Author's rating for second-stage exercises

ex_num - number of exercises of a given author;
avg_length - the average wording length in symbols;
avg_time(min) - the average time (in minutes) which spent for solution of one exercise of a given author by the leaders of rating system (TOP 20);
avg_ball - the average of points received by participants' voting over all exercises of an author;
num_vote - number of votes given for all problems of an author
rating - num_vote*avg_ball;

No author ex_num avg_length avg_time avg_ball num_vote rating
1 Moiseenko S.I. (Serge I) 32 289 987 7.8 5559 43360.2
2 Kurochkin P.A. (qwrqwr) 30 615 8776 8.3 3142 26078.6
3 Yakutin N.V. (ZrenBy) 8 363 1026 7.6 2361 17943.6
4 Zotov P.G. (Ozzy) 20 1032 18463 8.4 1823 15313.2
5 Gershovich V.(VIG) 7 311 998 8.0 1778 14224.0
6 Valuev D.I. (Fiolent) 8 400 684 7.9 1447 11431.3
7 Drozdkov A.N. (anddros) 17 638 26343 8.5 1330 11305.0
8 Novikov D.A. (DimaN) 5 418 487 7.6 1254 9530.4
9 Vojnov P.E. (paparome) 6 717 18216 8.7 819 7125.3
10 Grinkevich D.L. (Dmitrij Grinkevich) 6 655 10298 7.8 839 6544.2
11 Bezhaev A.Yu. (Baser) 26 873 32612 8.5 709 6026.5
12 Gorbunov A.V. (risp) 3 1031 1889 8.2 727 5961.4
13 Krasovskij E.A. (pegoopik) 29 898 22926 8.9 641 5704.9
14 Koptel'tsev V.(selber) 24 669 8183 9.0 581 5229.0
15 Karasyova N.V. (vlksm) 9 944 25683 8.8 506 4452.8
16 Sal'nikov S.A. ($erges) 6 843 18506 8.8 460 4048.0
17 Chobitok V.(vasia armor) 1 547 165 8.1 442 3580.2
18 Mal'tsev A.V. (Palkin) 1 302 733 8.4 397 3334.8
19 Muravejko O.Yu. (Aaz) 1 686 107 7.0 473 3311.0
20 Petrov D.B. (GiBis) 1 628 142 7.5 355 2662.5
21 Golubin R.S. (Roman Golubin) 1 462 2650 9.3 184 1711.2
22 Chebykin D.(GriGrim) 4 836 19445 9.0 189 1701.0
23 Sribnyak A.(silver) 1 924 1634 8.8 191 1680.8
24 Makarov I.A. (_Bkmz_) 2 744 3608 8.1 207 1676.7
25 Yuldashev M.R. (Snowbear) 2 904 4392 8.8 170 1496.0
26 Zverev D.L. (dimzv) 2 399 967 8.2 182 1492.4
27 Kukushkin S.A. (smog) 2 576 458 8.9 160 1424.0
28 Murashkin I.V. (lepton) 1 896 181 8.6 157 1350.2
29 Vanin V.(_Virt_) 1 1477 637 8.2 154 1262.8
30 Kuvalkin K.S. (Cyrilus) 2 759 25531 9.2 137 1260.4
31 Deev A.V. (pickman) 2 1149 2341 8.3 149 1236.7
32 Yunusov R.N. (Ruslan1707) 1 366 324 7.5 159 1192.5
33 Shuravin E.P. (dumkan) 1 492 4705 8.0 143 1144.0
34 Pechatnov V.V. (pvv) 3 838 6724 8.3 137 1137.1
35 Pyrkin S.(crescent) 1 585 1169 8.9 120 1068.0
36 Ostapchuk A.B. (_ORA_) 1 381 364 7.5 135 1012.5
37 Radar Yu.V. (inkerman) 2 876 28648 8.5 109 926.5
38 Mikhajlov V.G. (mslava) 1 439 216 7.1 125 887.5
39 Shkarednyj I.N. (Gosha) 2 310 292 9.0 96 864.0
40 Chernov D.V. (Kursist) 4 1181 26711 8.5 98 833.0
41 Utyonkov M.N. (=Maxim=) 3 862 17000 8.7 75 652.5
42 Maslyaev V.S. (Velmont) 1 699 20866 9.6 65 624.0
43 Lyaskovskij V.L. (blr_Oliver) 1 522 1632 9.1 38 345.8
44 Latyntsev N.G. (aks_nsk) 2 733 63065 8.9 37 329.3
45 Nikotin V.M. (@Nikotin) 1 863 18047 8.6 22 189.2
46 Dvoryaninov V.(Valdaj) 1 1599 2524 8.5 22 187.0
47 Kostomarov A.V. (al29) 3 1114 4593 9.7 19 184.3
48 Boiko D.(Angellore) 1 340 4786 9.4 16 150.4
49 P_ N.(no_more) 1 128 9.2 16 147.2
50 Fomichev A.V. (Fomichev) 1 1684 40183 7.0 19 133.0
51 Mikheev D.S. (Sfinks) 1 1268 8.6 13 111.8
52 Filippkin D.V. (_dimon_) 1 481 8415 10.0 11 110.0
53 Doschenko V.N. (mcrain) 2 1369 3814 8.4 10 84.0


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