Difference Between Union & Union All in MySQL || MySQL Tutorial series || Code With Neha
In my previous video of mysql series I have discussed about union in MySQL
You can check the video from the above I button
Today I am going to discuss about union and union all in mysql so without any further delay let's get started
Difference between UNION and Union All
UNION UNION ALL
Combines result from multiple tables
and returns the distinct records into a single result set.Whereas Union All Combines the result from multiple tables and returns all the records into a single result set.
Union has a default feature to eliminate duplicate rows from the table union all can’t eliminate the duplicate rows from the table.
Union has Slow performance as it removes duplicate rows from the output whereas union all has Fast performance as compared to UNION.
Syntax for union SELECT column_names
FROM table_1
WHERE conditions
UNION
SELECT column_names
FROM table_2
WHERE conditions
Syntax for union all
SELECT column_names
FROM table_1
WHERE conditions
UNION ALL
SELECT column_names
FROM table_2
WHERE conditions
that's all for today Hope you all will get some help from this video
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See you in the next video till then Stay Safe Stay Happy
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