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The DELETE Statement
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You use the DELETE statement to remove rows from a table. The DELETE statement has the following structure: DELETE FROM <table> [WHERE ,condition>]; For example, if you want to delete employee Fay s row from the employees table, you would use the following DELETE statement: SQL> DELETE FROM employees 2* WHERE last_name='Fay'; 1 row deleted. If you don t have a limiting WHERE condition, the DELETE statement will result in the removal of all the rows in the table, as shown here: SQL> DELETE FROM X;
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APPENDIX ORAC LE DATABA SE 11G S QL A ND PL/SQL: A BRIEF PRIMER
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You can also remove all rows in a table using the TRUNCATE command, but you can t undo or roll back the TRUNCATE command s effects. You can undo a delete by using the ROLLBACK statement: SQL> ROLLBACK;
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The UPDATE Statement
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The UPDATE statement changes the value (or values) of one or more columns of a row (or rows) in a table. The expression to which a column is being set or modified can be a constant, arithmetic, or string operation, or the product of a SELECT statement. The general structure of the UPDATE statement is as follows (note that the elements in square brackets are optional): UPDATE <table> SET <column i> = <expression i>, . . . , <column j> = <expression j> [WHERE <condition> ]; If you want to change or modify a column s values for all the rows in the table, you use an UPDATE statement without a WHERE condition: SQL> UPDATE persons SET salary=salary*0.10; If you want to modify only some rows, you need to use the WHERE clause in your UPDATE statement: SQL> UPDATE persons SET salary = salary * 0.10 WHERE review_grade > 5;
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Filtering Data
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The WHERE clause in a SELECT, INSERT, DELETE, or UPDATE statement lets you filter data. That is, you can restrict the number of rows on which you want to perform a SQL operation. Here s a simple example: SQL> INSERT INTO a SELECT * FROM b WHERE city='DALLAS';
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Sorting the Results of a Query
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Frequently, you ll have to sort the results of a query in some order. The ORDER BY clause enables you to sort the data based on the value of one or more columns. You can choose the sorting order (ascending or descending) and you can choose to sort by column aliases. You can also sort by multiple columns. Here s an example: SQL> SELECT employee_id, salary FROM employees ORDER BY salary;
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Changing the Sorting Order
Be default, an ORDER BY clause sorts in ascending order. If you want to sort in descending order, you need to specify the DESC keyword: SQL> SELECT employee_id, salary FROM employees ORDER BY salary desc;
A PPEN DI X O RA CLE D AT A BASE 11G S Q L AND PL/S QL: A BRI EF PRIME R
Sorting by Multiple Columns
You can sort results based on the values of more than one column. The following query sorts on the basis of two columns, salary and dept: SQL> SELECT employee_id, salary FROM employees ORDER BY salary, dept;
Operators
SQL provides you with a number of operators to perform various tasks, such as comparing column values and performing logical operations. The following sections outline the important SQL operators: comparison operators, logical operators, and set operators.
Comparison Operators
Comparison operators compare a certain column value with several other column values. These are the main comparison operators: BETWEEN: Tests whether a value is between a pair of values IN: Tests whether a value is in a list of values LIKE: Tests whether a value follows a certain pattern, as shown here: SQL> SELECT employee_id from employees WHERE dept LIKE 'FIN%';
Logical Operators
The logical operators, also called Boolean operators, logically compare two or more values. The main logical operators are AND, OR, NOT, GE (greater than or equal to), and LE (less than or equal to). Here s an example that illustrates the use of some of the logical operators: SQL> SELECT last_name, city WHERE salary GT 100000 and LE 200000; When there are multiple operators within a single statement, you need rules of precedence. Oracle always evaluates arithmetical operations such as multiplication, division, addition, and subtraction before it evaluates conditions. The following is the order of precedence of operators in Oracle, with the most important first: =, !=, <, >, <=, >= IS NULL, LIKE, BETWEEN, IN, EXISTS NOT AND OR
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