To aggregate the results of two or more SELECT operations, use the UNION operator. Within UNION, every SELECT statement must have the same amount of columns. The data types in the columns must also be similar.
The Union operator joins the results of two or more searches into a single result set that contains all of the rows from all of the Union's inquiries. It combines two more searches and removes duplicates in this operation. Tables 'A' and 'B', for example, have 1,2, and 3, while table 'C' has 3,4,5.
The UNION operator in SQL Server is used to join the results of two or more SELECT statements. Between the several SELECT statements, it removes duplicate rows. In the result sets, each SELECT statement within the UNION operator must have the same number of columns with similar data types.
Union is faster since it just passes the first SELECT command, parses the second, and adds the results to the end of the output table.
Learner's Ratings
4.6
Overall Rating
69%
23%
8%
0%
0%
Reviews
G
GAJANAN DIGAMBAR MODE
5
very easy to understand SQL its was dream to learn SQL. Thanx for Learnvern
M
Mohmad Shadab
5
BEST VIDEOS
N
NAGASWETHA
5
very useful
M
mohd aamir
4
Hi Team,
Why you didn't teach/learn how to write select query, even you shared 15 question for practice :(
Y
Yashvant Kadwe
5
I have found the course to be interesting with plenty of valuable information provided as part of the course and through interaction with fellow teachers and trainers from a wide range of disciplines
A
Arvind
4
Practise exercise required
S
Suryawanshi Sripad
5
It's good
A
ashutosh verma
4
good for practise
P
Priya
5
thank u learnvern
U
umesh dubey
5
very easy to understand SQL its was dream to learn SQL
Share a personalized message with your friends.