Union constant values : Union « Select Clause « SQL / MySQL

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SQL / MySQL » Select Clause » Union 
Union constant values
   
mysql>
mysql>
mysql> SELECT   LETTER1 || LETTER2 || LETTER3
    -> FROM    (SELECT 'a' AS LETTER1 UNION SELECT 'b'
    ->          UNION SELECT 'c' UNION SELECT 'd') AS LETTERS1,
    ->         (SELECT 'a' AS LETTER2 UNION SELECT 'b'
    ->          UNION SELECT 'c' UNION SELECT 'd') AS LETTERS2,
    ->         (SELECT 'a' AS LETTER3 UNION SELECT 'b'
    ->          UNION SELECT 'c' UNION SELECT 'd') AS LETTERS3;
+-------------------------------+
| LETTER1 || LETTER2 || LETTER3 |
+-------------------------------+
|                             0 |
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+-------------------------------+
64 rows in set (0.00 sec)

mysql>

   
    
    
  
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13.Put branket for union
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17.Alias the union tables in subquery
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19.Union the result of sum() aggregate function
20.Limit then union
21.Union grouped value
22.Union all
23.Using Union for subquery
24.Union constant value
25.Insert with union result
26.Create view for union
27.Create view for union constants
28.Display all data in "ps_games", "xbox_games" and "cube_games" as a single result set
29.Selecting Records in Parallel from Multiple Tables
30.To select a single winner from each table and combine the results
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