Rating of second-stage exercises (median) on SQL Exercises

October 20, 00:59 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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Rating of 2nd-stage exercises (median)

Rating of second-stage exercises (average)

No - exercise number; Bonus - level of difficulty;
Solved - number of visitors, who have solved this exercise;
Time(min) - the median time (calculated over all participants) that has been spent for solution in minutes;
noOK - number of visitors, who have not solved this exercise yet.
(Click on a cell to see list of these);
Length - wording length in symbols;
Rank - average score on a result of voting.

No	Bonus	Solved	Time(min)	noOK	Length	Author	Date	Rank
217	4	9	31871	4	549	pegoopik	2015-08-28	9.2 (5)
147	4	26	14593	2	1213	$erges	2010-08-06	9.7 (19)
157	3	24	12925	2	960	anddros	2009-06-05	9.6 (15)
163	3	19	11408	0	1640	Ozzy	2010-01-08	9.6 (14)
143	5	44	11333	14	946	inkerman	2007-10-07	8.8 (29)
214	4	11	10103	0	433	pegoopik	2015-05-30	10.0 (7)
259	4	22	9370	2	276	anddros	2009-08-24	9.5 (13)
155	3	26	8819	2	761	vlksm	2009-04-17	9.9 (18)
216	3	11	8681	1	279	pegoopik	2015-05-15	9.9 (8)
181	4	15	8489	1	1869	Ozzy	2011-10-08	9.7 (10)
194	4	15	7997	1	1461	pegoopik	2012-07-13	10.0 (11)
234	3	3	7476	1	1481	Kursist	2020-02-28	9.5 (2)
253	3	30	7278	7	1097	$erges	2008-05-17	8.9 (20)
230	2	7	6677	1	728	pegoopik	2018-07-27	9.8 (4)
257	4	17	6467	1	2758	pegoopik	2012-02-20	9.4 (13)
138	5	144	6385	33	949	Cyrilus	2005-12-09	9.2 (64)
161	3	21	6370	3	889	Ozzy	2009-11-06	9.2 (17)
224	3	10	6363	0	1979	selber	2017-04-14	9.4 (7)
231	3	5	6186	0	787	mcrain	2018-08-24	10.0 (3)
206	4	14	6127	0	1484	Baser	2013-11-23	9.1 (12)
225	2	9	6053	0	737	pegoopik	2017-07-15	9.8 (6)
211	2	13	5791	1	588	Baser	2014-06-30	9.8 (9)
255	4	14	5666	3	793	vlksm	2012-02-14	9.8 (9)
229	3	6	5468	1	1532	al29	2018-03-23	9.6 (5)
154	4	25	4892	3	848	anddros	2009-03-18	9.9 (17)
160	3	26	4731	0	961	Ozzy	2009-08-07	9.6 (17)
159	3	17	4480	0	565	anddros	2012-07-22	8.2 (14)
220	3	6	4388	1	1175	pegoopik	2016-12-17	10.0 (3)
232	3	5	4384	0	513	al29	2018-08-20	10.0 (4)
191	3	14	4212	0	948	qwrqwr	2012-06-08	9.5 (11)
252	2	34	3918	3	308	Ozzy	2009-06-14	8.3 (23)
149	3	33	3909	2	506	$erges	2008-09-08	9.2 (21)
172	3	21	3717	0	1719	Ozzy	2011-03-11	9.7 (15)
171	3	19	3682	1	1670	Ozzy	2010-12-05	9.3 (15)
116	5	233	3494	20	469	$erges	2008-12-13	9.3 (107)
218	4	12	3491	2	1500	al29	2016-04-04	9.6 (7)
189	4	15	3350	0	1563	Baser	2012-02-05	8.6 (12)
119	5	94	3203	5	703	Velmont	2014-03-07	9.7 (49)
188	3	17	3191	1	733	qwrqwr	2012-02-04	9.8 (12)
151	3	32	3152	5	1096	anddros	2008-12-30	8.9 (19)
208	3	14	3063	0	821	pegoopik	2013-12-20	8.8 (12)
167	3	24	3032	0	674	qwrqwr	2011-01-18	9.9 (15)
156	2	51	3004	3	391	anddros	2009-04-17	9.1 (29)
187	3	25	2965	0	978	=Maxim=	2011-12-31	8.8 (20)
144	4	44	2928	4	950	pvv	2008-01-01	7.3 (27)
100	4	238	2919	10	650	qwrqwr	2010-04-27	9.4 (118)
102	4	170	2786	6	933	GriGrim	2011-07-16	9.4 (77)
153	3	35	2779	5	1539	Ozzy	2009-02-14	9.5 (20)
120	4	93	2578	1	239	pegoopik	2014-02-14	8.9 (44)
221	2	13	2539	0	1023	Baser	2016-11-05	8.6 (8)
190	4	16	2521	1	717	vlksm	2012-03-17	8.8 (13)
141	4	78	2335	9	977	vlksm	2006-10-29	9.0 (35)
179	3	17	2329	0	844	pegoopik	2011-09-17	9.2 (12)
178	3	22	2268	1	1680	Baser	2011-08-13	9.1 (15)
101	4	203	2145	17	1096	pegoopik	2010-11-20	9.4 (107)
227	3	9	2137	1	2142	mcrain	2017-12-08	7.0 (5)
210	2	14	2132	0	483	_dimon_	2014-02-07	10.0 (11)
145	3	69	2007	1	859	pvv	2008-01-07	8.6 (33)
184	2	25	1953	2	432	Baser	2011-11-26	8.8 (19)
164	2	37	1943	1	1622	anddros	2010-04-26	9.7 (22)
148	2	65	1924	7	894	vlksm	2008-09-06	9.3 (35)
72	4	996	1917	151	608	paparome	2005-12-03	9.2 (263)
98	4	571	1912	44	538	ZrenBy	2003-09-01	8.2 (126)
205	2	15	1877	0	529	qwrqwr	2013-11-22	8.9 (10)
193	2	21	1798	0	522	Baser	2012-07-06	8.3 (15)
87	4	620	1724	90	459	Roman Golubin	2006-07-14	9.3 (170)
89	3	400	1686	29	870	_Bkmz_	2008-06-21	7.8 (147)
150	4	36	1652	4	909	@Nikotin	2008-11-09	8.5 (21)
137	4	189	1619	24	616	Cyrilus	2005-03-06	9.2 (66)
183	2	30	1611	2	518	GriGrim	2011-11-12	9.1 (15)
146	3	60	1606	3	949	paparome	2008-01-22	9.7 (33)
223	2	12	1596	0	641	Baser	2016-11-12	9.9 (7)
222	2	11	1583	1	1475	pegoopik	2016-12-23	9.8 (8)
182	3	22	1566	0	1377	Baser	2011-10-29	8.1 (17)
219	2	15	1565	0	486	pegoopik	2016-04-08	9.9 (8)
175	3	29	1548	0	2151	pegoopik	2011-04-28	8.5 (22)
165	2	30	1544	3	1600	vlksm	2010-03-18	9.9 (18)
228	1	18	1540	1	1419	qwrqwr	2018-01-12	10.0 (10)
121	3	395	1529	4	804	ZrenBy	2004-02-26	7.8 (91)
169	3	29	1519	0	1559	Valdaj	2010-09-02	8.4 (21)
196	3	25	1494	0	661	qwrqwr	2013-05-17	9.4 (15)
136	3	111	1492	5	618	Ozzy	2011-05-12	7.3 (47)
176	3	31	1484	0	385	qwrqwr	2011-05-20	9.5 (21)
200	3	18	1463	0	1129	qwrqwr	2013-10-05	9.3 (12)
132	3	108	1453	4	2500	risp	2010-01-25	7.6 (54)
198	2	23	1444	0	332	Angellore	2013-09-13	9.4 (16)
152	3	46	1420	4	1301	vlksm	2009-01-05	9.7 (27)
123	3	233	1405	39	1254	Ozzy	2009-08-22	9.0 (107)
233	1	13	1394	1	2321	pegoopik	2019-03-08	10.0 (7)
180	3	32	1375	0	274	qwrqwr	2011-09-16	9.6 (24)
106	3	270	1362	5	647	vlksm	2008-11-27	8.8 (114)
76	3	430	1356	16	949	silver	2010-01-23	8.8 (170)
199	3	20	1350	0	1448	Baser	2013-08-17	8.4 (14)
213	2	26	1346	0	369	qwrqwr	2014-10-17	9.6 (15)
158	3	38	1330	0	1174	Ozzy	2010-04-09	8.9 (23)
215	2	23	1326	0	331	pegoopik	2015-03-06	9.3 (13)
135	3	62	1323	1	854	qwrqwr	2013-04-19	8.9 (33)
96	3	401	1322	81	572	anddros	2008-11-22	8.8 (157)
77	2	284	1320	31	1053	selber	2015-07-10	8.7 (118)
212	3	16	1319	0	585	Baser	2014-10-14	8.9 (10)
69	2	141	1280	7	210	Gosha	2017-12-15	8.9 (49)
85	3	350	1279	17	1397	Ozzy	2009-10-10	8.5 (134)
82	3	369	1279	12	1780	_Virt_	2010-04-27	8.2 (135)
207	3	16	1255	0	486	pegoopik	2016-01-15	10.0 (8)
226	3	9	1235	2	2054	pegoopik	2017-10-14	9.2 (5)
68	3	263	1232	21	608	pegoopik	2014-08-01	8.0 (103)
186	1	37	1215	0	1447	Ozzy	2011-12-30	9.2 (24)
65	3	671	1178	47	671	Ozzy	2010-01-29	7.7 (240)
173	1	52	1172	2	945	Ozzy	2011-01-13	9.3 (28)
168	2	42	1159	2	455	qwrqwr	2010-08-27	9.5 (24)
84	3	397	1154	18	815	Ozzy	2009-12-26	8.4 (144)
93	3	154	1134	5	492	qwrqwr	2014-03-14	9.3 (64)
134	3	173	1041	4	821	pvv	2008-01-22	8.6 (68)
37	3	682	937	28	673	qwrqwr	2013-02-22	8.0 (240)
140	2	80	925	2	578	_Bkmz_	2010-01-30	8.9 (40)
71	3	519	829	20	941	anddros	2009-12-26	8.4 (181)
125	3	359	765	3	526	dimzv	2004-02-29	8.7 (84)
185	1	43	688	3	782	=Maxim=	2011-11-25	7.9 (25)
110	3	420	673	11	942	Snowbear	2006-03-14	8.8 (107)
195	3	26	658	0	722	Dmitrij Grinkevich	2013-04-20	9.1 (15)
126	2	179	633	11	944	$erges	2008-09-07	8.6 (87)
99	3	184	617	8	956	Dmitrij Grinkevich	2012-05-05	8.1 (74)
58	3	556	604	10	440	qwrqwr	2013-03-01	8.2 (199)
251	4	68	594	3	850	paparome	2006-10-01	8.0 (29)
162	2	59	592	0	1067	Ozzy	2009-12-26	9.3 (34)
307	2	19	553	0	1095	Baser	2017-06-29	8.5 (11)
130	2	115	541	0	700	anddros	2010-05-22	8.8 (57)
174	1	56	535	0	1084	qwrqwr	2011-02-25	9.3 (32)
202	2	29	504	0	557	qwrqwr	2013-11-01	9.1 (16)
45	2	370	482	16	509	dumkan	2016-04-03	8.0 (104)
64	3	556	481	46	508	qwrqwr	2010-05-13	7.9 (176)
66	3	631	461	53	392	anddros	2009-12-26	8.4 (241)
127	2	55	443	2	985	GriGrim	2014-12-21	7.7 (24)
107	2	393	428	9	688	Fiolent	2004-02-26	8.1 (93)
254	1	45	420	1	1383	Baser	2011-09-02	8.8 (27)
115	2	67	405	1	736	selber	2016-05-28	9.2 (27)
177	1	53	390	0	935	pegoopik	2011-07-17	8.5 (26)
142	2	113	388	1	944	paparome	2007-03-24	9.0 (47)
80	2	322	381	10	453	qwrqwr	2011-10-21	8.9 (128)
23	3	1472	377	121	249	Palkin	2007-03-29	8.3 (356)
166	1	59	375	2	449	anddros	2010-07-26	9.6 (30)
170	2	54	332	1	320	qwrqwr	2010-10-24	9.0 (27)
88	3	267	331	5	521	crescent	2011-03-23	8.9 (107)
209	1	33	319	1	735	Baser	2013-12-30	8.0 (15)
92	2	544	311	9	405	paparome	2006-07-26	8.5 (117)
139	2	124	310	2	907	Snowbear	2006-09-09	8.3 (44)
36	3	954	307	20	788	risp	2011-05-06	8.0 (294)
111	2	442	280	3	545	Fiolent	2005-01-19	8.3 (92)
41	3	1051	276	17	271	qwrqwr	2010-04-26	8.1 (336)
47	3	882	271	16	608	qwrqwr	2010-11-20	8.0 (270)
60	3	2004	263	119	353	Serge I	2005-03-05	7.8 (316)
29	2	993	257	42	695	GiBis	2011-09-17	7.5 (320)
54	2	1275	256	45	706	Ozzy	2008-09-06	8.2 (444)
12	1	278	244	40	348	Serge I	2019-04-12	7.3 (72)
262	2	11	243	0	684	selber	2019-06-21	6.5 (6)
118	2	415	236	1	206	Fiolent	2004-01-05	8.2 (81)
133	2	89	233	0	1614	pickman	2011-07-01	8.2 (46)
204	1	34	232	1	366	anddros	2013-11-19	8.7 (17)
67	2	548	226	16	729	Ozzy	2010-04-27	8.3 (191)
91	2	211	222	2	642	smog	2012-05-26	9.1 (85)
105	2	127	219	0	610	Baser	2013-09-20	8.5 (47)
122	1	124	217	2	725	Dmitrij Grinkevich	2012-09-14	5.9 (48)
34	2	1092	217	25	750	qwrqwr	2010-09-24	7.9 (336)
129	2	270	205	7	658	DimaN	2004-03-01	7.5 (57)
40	1	212	202	14	398	Serge I	2018-09-07	7.1 (64)
131	2	88	192	1	498	GriGrim	2012-05-25	8.5 (41)
43	2	453	190	3	648	qwrqwr	2015-04-24	8.5 (146)
75	2	377	189	4	644	qwrqwr	2011-07-22	7.4 (135)
260	2	52	183	0	999	qwrqwr	2012-02-03	7.7 (35)
303	2	7	182	0	1634	MikhailYakovlev535	2020-06-23	4.5 (4)
20	2	1406	181	35	249	VIG	2003-09-01	8.0 (321)
55	2	457	178	8	324	VIG	2005-06-26	7.6 (87)
49	2	1113	177	22	862	anddros	2009-06-05	7.9 (347)
86	2	332	176	0	433	Ozzy	2010-03-05	8.6 (109)
62	2	652	175	9	446	Dmitrij Grinkevich	2012-02-11	8.0 (209)
261	1	35	169	1	1495	Fomichev	2013-12-07	7.0 (19)
61	2	906	165	5	781	risp	2009-12-26	8.4 (302)
203	1	40	160	1	932	=Maxim=	2013-10-05	9.4 (23)
124	2	365	155	3	455	DimaN	2004-02-26	8.3 (80)
16	2	812	153	61	336	qwrqwr	2014-07-18	7.4 (234)
59	2	852	152	6	220	VIG	2003-12-22	8.3 (187)
95	1	80	152	2	350	qwrqwr	2017-12-01	9.3 (35)
304	2	24	151	0	1132	aks_nsk	2016-02-05	9.3 (15)
38	2	954	149	21	297	ZrenBy	2003-09-01	7.6 (189)
74	2	646	143	8	855	vlksm	2008-06-21	8.3 (194)
109	2	482	133	1	671	VIG	2003-12-23	8.0 (90)
104	1	128	128	0	571	pegoopik	2013-07-19	8.4 (54)
201	2	38	127	0	749	Baser	2013-09-21	8.7 (23)
39	2	1305	122	20	263	Serge I	2003-08-28	7.5 (261)
83	2	518	120	4	798	lepton	2006-09-29	8.4 (141)
78	2	397	119	3	451	_ORA_	2010-04-27	7.5 (122)
52	1	428	118	3	274	Serge I	2015-01-10	8.6 (126)
81	2	577	118	12	707	$erges	2008-05-10	8.2 (160)
94	2	242	118	0	773	pickman	2011-04-27	8.2 (88)
33	2	1172	110	24	358	DimaN	2004-03-01	7.6 (327)
35	3	491	109	10	688	Baser	2015-09-18	8.8 (152)
197	1	43	107	0	518	pegoopik	2013-06-10	8.8 (19)
51	1	489	105	14	410	Fiolent	2004-06-23	8.1 (129)
44	2	665	104	8	348	Serge I	2011-11-25	7.9 (212)
79	1	947	104	14	403	Serge I	2003-06-05	7.7 (147)
128	1	224	104	4	829	inkerman	2007-09-14	8.3 (71)
90	1	224	102	0	499	Dmitrij Grinkevich	2012-03-03	7.8 (78)
46	2	1128	102	126	376	Serge I	2009-08-12	6.7 (303)
305	1	25	101	0	160	Baser	2017-01-06	8.9 (14)
70	1	648	100	3	334	Serge I	2009-04-17	7.8 (212)
57	2	1794	99	14	281	Serge I	2005-05-07	7.8 (292)
73	1	436	97	3	367	Ruslan1707	2010-11-02	7.4 (142)
50	1	759	93	5	414	mslava	2003-12-22	8.3 (166)
113	1	124	91	0	497	smog	2013-03-29	8.4 (50)
17	2	1554	88	23	122	VIG	2003-04-29	8.1 (304)
103	1	129	86	1	850	Baser	2013-10-05	7.2 (49)
114	1	440	83	4	298	Serge I	2003-12-24	8.4 (88)
10	1	614	83	45	179	Serge I	2017-01-20	8.0 (181)
256	1	39	82	1	436	anddros	2013-11-08	8.9 (20)
306	1	4	80	0	456	Kursist	2020-10-10	9.5 (2)
25	2	1148	79	29	208	DimaN	2004-06-22	7.0 (306)
24	2	1539	77	7	631	Aaz	2004-02-26	6.9 (436)
26	1	1400	73	24	269	VIG	2003-12-22	7.7 (341)
9	2	1289	72	27	498	vasia armor	2010-05-21	7.9 (381)
8	2	1352	66	81	600	Serge I	2008-06-21	7.6 (344)
28	1	1124	65	14	266	ZrenBy	2003-09-01	7.5 (214)
32	1	1275	63	7	529	Roman Golubin	2005-12-13	7.5 (295)
21	1	1118	63	9	680	paparome	2006-03-14	8.0 (259)
112	1	14	62	1	393	Gosha	2020-06-03	9.1 (10)
97	1	356	61	3	231	dimzv	2004-03-01	7.7 (77)
42	1	1549	56	14	254	Serge I	2003-06-05	7.6 (297)
117	1	417	55	0	193	Fiolent	2003-12-26	7.5 (77)
18	1	1546	54	7	157	ZrenBy	2003-09-01	7.6 (341)
192	2	48	52	0	709	Baser	2012-03-03	9.2 (25)
27	1	1194	51	8	368	Fiolent	2004-02-26	7.3 (277)
30	1	1670	50	3	154	Serge I	2003-08-28	7.9 (370)
48	1	1088	50	6	317	Serge I	2009-06-22	7.3 (288)
56	1	987	48	3	581	Fiolent	2004-06-22	7.9 (259)
19	1	1911	47	23	279	Serge I	2004-06-23	7.5 (393)
14	1	2356	47	36	116	Serge I	2003-04-08	7.5 (410)
22	1	1537	46	12	261	ZrenBy	2003-09-01	7.2 (355)
31	1	954	46	8	342	Fiolent	2004-06-22	7.8 (236)
108	1	485	46	0	412	mslava	2003-12-23	7.3 (88)
302	0	37	45	0	510	pegoopik	2012-07-27	7.6 (11)
63	1	1275	44	5	190	VIG	2003-06-05	7.6 (227)
7	1	2407	42	77	303	Serge I	2006-11-17	7.9 (451)
53	1	1399	40	25	230	DimaN	2004-03-01	7.6 (361)
13	1	1634	39	21	194	ZrenBy	2003-09-01	7.5 (383)
15	1	1118	34	7	287	Dmitrij Grinkevich	2012-04-21	7.5 (306)
11	1	1804	34	16	130	ZrenBy	2003-09-01	7.5 (410)
258	3	25	13	0	1070	Baser	2014-09-19	7.6 (10)
301	0	43	8	0	55	pegoopik	2012-03-23	8.9 (20)

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