Delete with order by and limit clause : Limits « Select Clause « SQL / MySQL






  1. SQL / MySQL
  2. Select Clause
  3. Limits

Delete with order by and limit clause

      
mysql>
mysql>
mysql> CREATE   TABLE PENALTIES
    ->         (PAYMENTNO      INTEGER      NOT NULL,
    ->          EmployeeNO       INTEGER      NOT NULL,
    ->          PAYMENT_DATE   DATE         NOT NULL,
    ->          AMOUNT         DECIMAL(7,2) NOT NULL,
    ->          PRIMARY KEY    (PAYMENTNO)          );
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> INSERT INTO PENALTIES VALUES (1,  6, '1980-12-08',100);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PENALTIES VALUES (2, 44, '1981-05-05', 75);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PENALTIES VALUES (3, 27, '1983-09-10',100);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PENALTIES VALUES (4,104, '1984-12-08', 50);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PENALTIES VALUES (5, 44, '1980-12-08', 25);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PENALTIES VALUES (6,  8, '1980-12-08', 25);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PENALTIES VALUES (7, 44, '1982-12-30', 30);
Query OK, 1 row affected (0.00 sec)

mysql> INSERT INTO PENALTIES VALUES (8, 27, '1984-11-12', 75);
Query OK, 1 row affected (0.00 sec)

mysql>
mysql> DELETE
    -> FROM     PENALTIES
    -> ORDER BY AMOUNT DESC, EmployeeNO ASC
    -> LIMIT    4;
Query OK, 4 rows affected (0.00 sec)

mysql>
mysql>
mysql> drop table penalties;
Query OK, 0 rows affected (0.00 sec)








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3.Use LIMIT
4.Another ORDER BY and limit
5.Simple LIMIT
6.Retrieving the Top Five Students
7.ORDER and limit
8.Limits and order
9.Scrolling through the entire product table four records at a time
10.Determining the Number of Records Suppressed by LIMIT (SQL_CALC_FOUND_ROWS, FOUND_ROWS)
11.Limiting a Selection Using LIMIT
12.Use ORDER BY to sort the result set. Then you can use LIMIT to find smallest and largest values.
13.Order the rows with the largest SUM( ) values first and use LIMIT to select the first record
14.A DELETE statement can be qualified by using an ORDER BY and a LIMIT clause
15.The LIMIT clause takes two arguments, as the following syntax shows: LIMIT [,]
16.SELECT statement includes a LIMIT clause that specifies an offset value of 3 and a row count value of 4
17.WHERE clause can include additional logical operators and expressions that further limit the results returned
18.Limit to first three columns
19.LIMIT 5 OFFSET 3
20.Pulling a Section from the Middle of a Result Set
21.Tell MySQL what offset to use, from which result to start limiting.
22.The default offset is 0, so by specifying an offset of 1, you're taking the second record.
23.Selecting Records from the Beginning or End of a Result Set
24.Processing the First or Last n Records
25.Limiting the Number of Results
26.But LIMIT allows you to return only that record