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Home / Tricky Select Queries / Question No: 53

How to retreive multiple records without a reference table?

I want to use a select statement to retrieve multiple records without a reference table. Obviously it is easy to retrieve a single record is simple enough:
SELECT 'val_1' AS var1, 'val_2' AS var2;

+--------+--------+
| var1 | var2 |
+--------+--------+
| val_1 | val_2 |
+--------+--------+
But I need to produce multiple records without referencing any tables:
+--------+--------+
| var1 | var2 |
+--------+--------+
| val_1 | val_2 |
| val_3 | val_4 |
| val_5 | val_6 |
+--------+--------+

Answer No: 53

To retrieve multiple records without a reference table, you can use UNION operator provided by MySQL. It may serve your goal.  Take an example:
SELECT  'val_1' AS var1,  'val_2' AS var2 
UNION
SELECT 'val_3' AS var1, 'val_4' AS var2
UNION
SELECT 'val_5' AS var1, 'val_6' AS var2;

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