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What is the difference between UNION and UNION ALL.
Started by Brian G on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
From http://zengin.wordpress.com/2007/07/31/union-vs-union....
The basic difference between UNION and UNION ALL is union operation eliminates the duplicated rows from the result set but union all returns all rows after joining.
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I have 2 tables with duplicate record including 'Id' field, and I need union them.
But I think [union all] is much more efficient than [union]
for the reason that it need not sorting.
Following is my sql:
SELECT *
FROM [dbo].[RealTime]
UNION ALL
SELECT...
Started by sesame on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Option 2 (UNION): query.
Dbo.Query, then for each row from dbo.Query, do a lookup on dbo.Realtime .
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Here's a breakdown on the union/find algorithm for disjoint set forests on wikipedia :
Barebone disjoint-set forests... ( O(n) ) ... with union by rank ... (now improved to O(log(n) ) ... with path compression (now improved to O(a(n)) , effectively O(...
Started by polygenelubricants on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
I googled....
Your Union's path compression but not rank.
In the worst case, you may end up with a linked list .
Assume that you skip to an unbalanced tree structure.
Union by rank helps to merge.
Path compression flattens the tree structure.
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I am trying to accomplish the following:
SELECT col1, col2 FROM table1 UNION SELECT col2, col3 FROM table2
With the result:
col1, col2, col3 1 , 1 , NULL NULL, 1 , 1
The union of the columns and the rows is returned. You could think of it as the UNION...
Started by Kuyenda on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
(10)) declare @t2 table(col2 varchar(10),col3 varchar(10)) insert into @t1 select '1','1' union all select '10','1' insert into @t2 select '1',null union all select '10','1' ;with cte1 as(select ROW.
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Is it worth it to join a union? I know the pay is better for the employees but whats in it for the owner? Does any one have any info? Where I live and work, alot of the projects are requiring union painters. And I've noticed, all the union companies are...
Started by Charles on
, 19 posts
by 9 people.
Answer Snippets (Read the full thread at painttalk):
They'll Have You Answer.
Go To The Union Hall And Ask Them.
Both sides are fairly well sold on how they conduct business ! ehhhh, the taboo question .
The benefits/pitfalls of union vs non-union.
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Quote: : what was the question?...lmao
Ya know, this thread WAS actually still on topic, and it kind of still is. The question was if it was worthwhile for an employer to move to a union shop and NOBODY, even union supporters could offer anything positive...
Started by Tonyg on
, 16 posts
by 6 people.
Answer Snippets (Read the full thread at painttalk):
As far as union....
You make the call.
Ability to bid on larger union/commercial jobs, labor pool to draw from for large jobs, cost to incur cost over runs with slow workers getting top dollar, dealing with the typical union politics, etc.
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Quote: : BushDude,
Again, it's not a republican problem it's a Union Mgt problem. The reason the union imploded down here was not because of politics but because of inept and greedy union leaders.
I'm sure the union leadership could do more for their ...
Started by Bushdude on
, 20 posts
by 11 people.
Answer Snippets (Read the full thread at painttalk):
That said, what does the fact that a right-to-work (for less) state or more into a union shop?
I realize that....
I have always been pro-union.
I am not offering an argument for or against union membership.
Wage and health insurance.
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Labor union sues Indiana, calls working alongside nonunion employees ‘slavery’ In a lawsuit against three Indiana government officials, a labor union alleged on Wednesday that its constitutional rights under the Thirteenth Amendment — which outlawed “...
Started by by dread on
, 11 posts
by 9 people.
Answer Snippets (Read the full thread at darwincentral):
But it turns out, being able to tell the union rep, "no....
You being on unemployment.)
I also didn't like that it was a union position.
In the People's Republic of New York, I always thought of union membership as a form of slavery.
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I've got a union :
union my_union { short int Int16; float Float; };
I'd like to create :
const my_union u1 = ???; const my_union u2 = ???;
and initialize their values to be of different types respectively : u1 -> int16 u2 -> float
How do I do that...
Started by Maciek on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
So
const my_union u1 = {1};
should work but this form cannot be used for the second (and subsequent....
A union is initialized with a brace-enclosed initializer, the braces shall only contain an initializer for the first member of the union.
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I'm looking for some union examples, not to understand how union works, hopefully I do, but to see which kind of hack people do with union.
So feel free to share your union hack (with some explanation of course :) )
Started by claferri on
, 9 posts
by 9 people.
Answer Snippets (Read the full thread at stackoverflow):
So....
Here's a little one I use every day:
struct tagVARIANT { union { struct __tagVARIANT { VARTYPE vt; WORD wReserved1; WORD wReserved2; WORD wReserved3; union { LONG lVal; /* VT_I4 */ BYTE bVal layouts depending on the exact instruction.
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