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Questions tagged union

21 questions

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62
votes
4
answers

Quick way to extend a set if we know elements are unique

python set union
asked 2013-06-05T12:00:23.853
16
votes
5
answers

Same number of columns for Union Operation

sql sql-server-2008-r2 union union-all
asked 2013-01-31T04:53:31.770
21
votes
3
answers

Combine multiple SELECT statements

sql postgresql union
asked 2012-08-06T12:58:06.757
35
votes
1
answers

PostgreSQL nested CTE and UNION

sql postgresql union common-table-expression
asked 2012-07-31T13:30:16.570
8
votes
2
answers

How to union across multiple tables in SQLAlchemy?

python sqlalchemy union
asked 2012-05-16T01:43:29.427
10
votes
10
answers

Algorithm to take the union of rectangles and to see if the union is still a rectangle

algorithm union computational-geometry
asked 2012-02-01T07:51:04.957
43
votes
3
answers

SQL returns less results when using UNION?

sql-server t-sql union
asked 2011-09-02T18:49:27.230
75
votes
7
answers

Incorrect usage of UNION and ORDER BY?

mysql sql-order-by union
asked 2011-07-18T12:10:00.823
15
votes
3
answers

reverse operation to "Union and find"

algorithm find union
asked 2011-06-22T10:00:52.327
206
votes
3
answers

How can I get the intersection, union, and subset of arrays in Ruby?

ruby union intersection subset
asked 2011-04-15T14:18:17.183
39
votes
3
answers

MySQL: FULL OUTER JOIN - How do I merge one column?

sql mysql union full-outer-join
asked 2010-12-11T03:54:15.263
66
votes
7
answers

SELECT INTO USING UNION QUERY

sql sql-server t-sql union derived-table
asked 2010-10-25T20:46:06.917
57
votes
7
answers

Merge two rows in SQL

sql join union
asked 2010-05-31T02:37:14.947
12
votes
3
answers

T-SQL UNION On 3 Tables?

t-sql union
asked 2010-02-25T17:24:29.057
20
votes
5
answers

Identifying source table from UNION query

sql union
asked 2009-09-10T12:06:56.777
21
votes
3
answers

Which is faster: Union or Concat?

c# .net linq union concatenation
asked 2009-08-26T21:48:11.180
67
votes
6
answers

Using union and count(*) together in SQL query

sql union
asked 2009-08-12T14:48:07.830
18
votes
5
answers

ORDER BY with a UNION of disparate datasets (T-SQL)

sql sql-server t-sql join union
asked 2009-06-16T22:42:37.927
13
votes
5
answers

Why are UNION queries so slow in MySQL?

mysql query-optimization union
asked 2009-05-15T17:59:01.887
87
votes
16
answers

SQL Query - Using Order By in UNION

sql ms-access sorting sql-order-by union
asked 2008-10-17T21:05:16.053
21
votes
8
answers

How do I Concatenate entire result sets in MySQL?

mysql sql union
asked 2008-08-06T18:47:24.137