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			21 lines
		
	
	
		
			831 B
		
	
	
	
		
			Plaintext
		
	
	
	
	
	
			
		
		
	
	
			21 lines
		
	
	
		
			831 B
		
	
	
	
		
			Plaintext
		
	
	
	
	
	
| USE tpch1;
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| drop table if exists user_prop_by_game;
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| drop table if exists visit;
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| create table user_prop_by_game(cl_id int, last_visit_date date)engine=columnstore;
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| create table visit(cl_id int, visit_date date)engine=columnstore;
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| insert into user_prop_by_game values (1, now()), (2, now());
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| Warnings:
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| Note	1265	Data truncated for column 'last_visit_date' at row 1
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| Note	1265	Data truncated for column 'last_visit_date' at row 2
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| insert into visit values (1, '2010-10-01'), (2, '2010-11-01'), (2,
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| '2010-10-01');
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| UPDATE user_prop_by_game UPBG, (SELECT cl_id, max(visit_date) AS max_date FROM
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| visit GROUP BY cl_id) sub SET UPBG.last_visit_date = sub.max_date WHERE
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| UPBG.cl_id = sub.cl_id;
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| select * from user_prop_by_game;
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| cl_id	last_visit_date
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| 1	2010-10-01
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| 2	2010-11-01
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| drop table if exists user_prop_by_game;
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| drop table if exists visit;
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