intersect

序 本文主要研究一下flink Table的Set Operations 实例 Union Table left = tableEnv.fromDataSet(ds1, "a, b, c"); Table right = tableEnv.fromDataSet(ds2, "a, b, c"); Table result = left.union(right); union方法类似sql的union UnionAll Table left = tableEnv.fromDataSet(ds1, "a, b, c"); Table right = tableEnv.fromDataSet(ds2, "a, b, c"); Table result = left.unionAll(right); unionAll方法类似sql的union all Intersect Table left = tableEnv.fromDataSet(ds1, "a, b, c"); Table right = tableEnv.fromDataSet(ds2, "d, e, f"); Table result = left.intersect(right); intersect方法类似sql的intersect IntersectAll Table left = tableEnv

When I have 2 List<string> objects, then I can use Intersect and Except on them directly to get an output IEnumerable<string> . That's simple enough, but what if I want the intersection/disjuction on something more complex? Example, trying to get a collection of ClassA objects which is the result of the intersect on ClassA object's AStr1 and ClassB object's BStr ; : public class ClassA { public string AStr1 { get; set; } public string AStr2 { get; set; } public int AInt { get; set; } } public class ClassB { public string BStr { get; set; } public int BInt { get; set; } } public class Whatever

I came across this example and I don't understand what it means. (SELECT drinker FROM Frequents) EXCEPT ALL (SELECT drinker FROM Likes); relations: Frequents(drinker, bar), Likes(drinker, beer) What does the ALL do in this case? How is the result different from the query below? (SELECT drinker FROM Frequents) EXCEPT (SELECT drinker FROM Likes); The SQL EXCEPT operator takes the distinct rows of one query and returns the rows that do not appear in a second result set. The EXCEPT ALL operator does not remove duplicates. For purposes of row elimination and duplicate removal, the EXCEPT operator

This is my query: -- Sids of suppliers who supply a green part AND a red part (SELECT Suppliers.sid FROM Suppliers JOIN Catalog ON Catalog.sid = Suppliers.sid JOIN Parts ON Parts.pid = Catalog.pid WHERE Parts.color = "red") INTERSECT (SELECT Suppliers.sid FROM Suppliers JOIN Catalog ON Catalog.sid = Suppliers.sid JOIN Parts ON Parts.pid = Catalog.pid WHERE Parts.color = "green"); This is the error: ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near "INTERSECT (SELECT Suppliers.sid FROM

Choose two. Which two statements are true about the results of using the INTERSECT operator in compound queres? A) Reversing the order of the intersected tables can sometimes affect the output. B) Column names in each SELECT in the compound query can be dfferent. C) INTERSECT returns rows common to both sides of the compound query. D) The number of columns in each SELECT in the compound query can be dfferent. E) INTERSECT ignores NULLs Answer：：BC (解析：intersect 会以第一个查询的第一个列的值进行排序输出，由于求的是交集，所以表的查询顺序可以不分先后;列的名字可以不一样，但是数据类型必须匹配。) 来源： https://my.oschina.net/u/3902946/blog/3131600

EDIT:here is the full code: https://dl.dropboxusercontent.com/u/65678182/assignment1.rar Any possible help is highly appreciated! I am trying to make a copy of the breakout game, but I have problems with checking if two objects (the ball and paddle) intersects. I have this method for collision detection for now: public static void handleCollisions() { System.out.println(ball.getBounds()); // just to check that they System.out.println(paddle.getBounds()); //are there and moving correct if (ball.getBounds().intersects(paddle.getBounds())) { System.out.println("collision"); } } I'm pretty sure

I have a Winforms app that allows the user to drag and drop some labels around the screen. The objective being to put the matching labels on top of each other. I keep a reference to these labels in a list, and at the moment i'm checking to see if they're overlapping by doing the following. foreach (List<Label> labels in LabelsList) { var border = labels[1].Bounds; border.Offset(pnl_content.Location); if (border.IntersectsWith(labels[0].Bounds)) { labels[1].ForeColor = Color.Green; } else { labels[1].ForeColor = Color.Red; } } The problem being that this is only good for Winforms (Bounds

I am trying to force MySQL to use two indexes. I am joining a table and I want to utilize the cross between the two indexes. The specific term is Using intersect and here is a link to MySQL documentation: http://dev.mysql.com/doc/refman/5.0/en/index-merge-optimization.html Is there any way to force this implementation? My query was using it (and it sped stuff up), but now for whatever reason it has stopped. Here is the JOIN I want to do this on. The two indexes I want the query to use are scs.CONSUMER_ID_1 and scs_CONSUMER_ID_2 JOIN survey_customer_similarity AS scs ON cr.CONSUMER_ID=scs