Use defined variable in new select clause : Select « Select Clause « SQL / MySQL

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SQL / MySQL » Select Clause » Select 
Use defined variable in new select clause

/*
mysql> SELECT * FROM report;
+---------+--------+-------+
| article | dealer | price |
+---------+--------+-------+
|    0001 | A      |  4.45 |
|    0001 | B      |  5.45 |
|    0002 | A      | 16.67 |
|    0003 | B      |  6.12 |
|    0003 | C      |  2.78 |
|    0003 | D      |  2.34 |
|    0004 | D      | 21.29 |
+---------+--------+-------+
7 rows in set (0.00 sec)

mysql> SELECT @min_price:=MIN(price),@max_price:=MAX(price) FROM report;
+------------------------+------------------------+
| @min_price:=MIN(price) | @max_price:=MAX(price) |
+------------------------+------------------------+
|                   2.34 |                  21.29 |
+------------------------+------------------------+
1 row in set (0.00 sec)

mysql> /* Using User Variables */
mysql> SELECT FROM report WHERE price=@min_price OR price=@max_price;
+---------+--------+-------+
| article | dealer | price |
+---------+--------+-------+
|    0003 | D      |  2.34 |
|    0004 | D      | 21.29 |
+---------+--------+-------+
rows in set (0.00 sec)


*/
Drop table report;  


CREATE TABLE report (
       article INT(4UNSIGNED ZEROFILL DEFAULT '0000' NOT NULL,
       dealer  CHAR(20)                 DEFAULT ''     NOT NULL,
       price   DOUBLE(16,2)             DEFAULT '0.00' NOT NULL,
       PRIMARY KEY(article, dealer));


INSERT INTO report VALUES (1,'A',4.45),
                        (1,'B',5.45),
                        (2,'A',16.67),
                        (3,'B',6.12),
                        (3,'C',2.78),
                        (3,'D',2.34),
                        (4,'D',21.29);
    
SELECT FROM report;    

SELECT @min_price:=MIN(price),@max_price:=MAX(priceFROM report;
  
/* Using User Variables */
SELECT FROM report WHERE price=@min_price OR price=@max_price;


           
       
Related examples in the same category
1. Define and use variable in select clause
2. Select clause with condition
3. Choose specific columns
4. Reference column in select command
5. Performing Mathematics
6. Simple Retrieval:Returning Multiple Columns
7. Simple Retrieval:Returning a Single Column
8. Simple Retrieval: Returning All Columns
9. Performing a Single Row INSERT
10. Retrieve all columns in a table
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