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March 10, 19:47 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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  • DML

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Distribution of the certificated professionals by age (percentage)
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Age	Percent
Under 30 years old	48.2
Between 30 and 40	37.0
Between 40 and 50	10.2
After 50 years old	4.6

Representation of the certificated professionals by regions

id_cont	id_reg	Region	Qty	Percent
1	37	MOSKVA (Russia)	154	36.2
2	32	UKRAINE	37	8.7
1	67	SANKT – PETERBURG (Russia)	35	8.2
1	48	NOVOSIBIRSK (Russia)	21	4.9
1	63	ROSTOV-NA-DONU (Russia)	15	3.5
1	21	EKATERINBURG (Russia)	11	2.6
2	3	BELARUS	10	2.3
1	58	PERM' (Russia)	10	2.3
1	6	BARNAUL (Russia)	7	1.6
1	19	VORONEZh (Russia)	6	1.4
1	69	SMOLENSK (Russia)	6	1.4
1	90	TULA (Russia)	6	1.4
8	3	KAZAKHSTAN	5	1.2
1	31	KRASNOYaRSK (Russia)	5	1.2
3	16	ISRAEL	4	0.9
1	4	ARKhANGEL'SK (Russia)	4	0.9
1	30	KRASNODAR (Russia)	4	0.9
1	75	TOMSK (Russia)	4	0.9
1	87	ChITA (Russia)	4	0.9
1	5	ASTRAKhAN' (Russia)	3	0.7
1	8	BELGOROD (Russia)	3	0.7
1	98	LIPETsK (Russia)	3	0.7
1	52	OREL (Russia)	3	0.7
1	93	TAMBOV (Russia)	3	0.7
1	82	UFA (Russia)	3	0.7
1	92	ChEBOKSARY (Russia)	3	0.7
1	85	ChELYaBINSK (Russia)	3	0.7
8	8	GEORGIA	2	0.5
2	25	POLAND	2	0.5
1	1	ABAKAN (Russia)	2	0.5
1	25	KAZAN' (Russia)	2	0.5
1	97	KALININGRAD (Russia)	2	0.5
1	94	KALUGA (Russia)	2	0.5
1	29	KOSTROMA (Russia)	2	0.5
1	47	NOVOKUZNETsK (Russia)	2	0.5
1	51	OMSK (Russia)	2	0.5
1	64	RYaZAN' (Russia)	2	0.5
1	68	SARATOV (Russia)	2	0.5
5	1	AUSTRALIA	1	0.2
6	2	CANADA	1	0.2
2	8	DENMARK	1	0.2
4	13	EGYPT	1	0.2
2	11	ESTONIA	1	0.2
2	13	FRANCE	1	0.2
2	23	MOLDOVA	1	0.2
8	5	TAJIKISTAN	1	0.2
8	6	TURKMENISTAN	1	0.2
1	10	BLAGOVESchENSK (Russia)	1	0.2
1	12	BRATSK (Russia)	1	0.2
1	13	BRYaNSK (Russia)	1	0.2
1	15	VLADIVOSTOK (Russia)	1	0.2
1	96	VLADIKAVKAZ (Russia)	1	0.2
1	16	VOLGOGRAD (Russia)	1	0.2
1	17	VOLOGDA (Russia)	1	0.2
1	23	IZhEVSK (Russia)	1	0.2
1	99	KEMEROVO (Russia)	1	0.2
1	42	NERYuNGRI (Russia)	1	0.2
1	44	NIZhNEVARTOVSK (Russia)	1	0.2
1	45	NIZhNIJ NOVGOROD (Russia)	1	0.2
1	46	NOVGOROD (Russia)	1	0.2
1	57	PENZA (Russia)	1	0.2
1	66	SAMARA (Russia)	1	0.2
1	95	STAVROPOL' (Russia)	1	0.2
1	70	SURGUT (Russia)	1	0.2
1	71	SYKTYVKAR (Russia)	1	0.2
1	72	TVER' (Russia)	1	0.2
1	77	TYuMEN' (Russia)	1	0.2
1	83	KhABAROVSK (Russia)	1	0.2
1	91	ELISTA (Russia)	1	0.2
1	89	YaROSLAVL' (Russia)	1	0.2

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