Oracle 第2节过滤和排序数据

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LessonAim

While retrieving data from the database, you may need to restrict the rows of data that are displayed or specify the order in which the rows are displayed. 

This lesson explains the SQL statements that youuse to perform these actions.

SELECT  *|{[DISTINCT] column|expression [alias],...}

FROM  table

[WHERE  condition(s)];

SELECT employee_id,last_name,job_id,department_id

FROM   employees

WHERE  department_id = 90 ;

SELECTlast_name,hire_date,department_id

FROM   employees

WHERE  hire_date =‘7-6月-1994‘

SELECT last_name, salary

FROM   employees

WHERE  salary <= 3000;

1.

SELECT last_name, salary

FROM  employees

WHERE salary BETWEEN 2500 AND 3500;

2.

SELECT employee_id,last_name, salary,manager_id

FROM   employees

WHERE  manager_id IN (100, 101, 201);

3.

SELECT  first_name

FROM   employees

WHERE  first_name LIKE ‘S%‘;

4.

SELECT last_name

FROM   employees

WHERE  last_name LIKE ‘_o%‘;

SELECT job_id

FROM   jobs

WHERE  job_id LIKE ‘IT\_%‘ escape ‘\‘;

5.

使用IS (NOT)NULL 判断空值。

SELECT last_name,manager_id

FROM   employees

WHERE  manager_id IS NULL;

Oracle 第2节过滤和排序数据

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原文地址：http://blog.csdn.net/u014338577/article/details/47113547