1.The SQL introuduction
Introducing Oracle Database 11g
List the features of Oracle Database 11g
Discuss the basic design, theoretical and physical aspects of a relational database
Categorize the different types of SQL statements
Describe the data set used by the course
Log onto the database using the SQL Developer environment
Save queries to files and use script files in SQL Developer
Retrieving Data Using the SQL SELECT Statement
List the capabilities of SQL SELECT statements
Generate a report of data from the output of a basic SELECT statement
Select All Columns
Select Specific Columns
Use Column Heading Defaults
Use Arithmetic Operators
Understand Operator Precedence
Learn the DESCRIBE command to display the table structure
Restricting and Sorting Data
Write queries that contain a WHERE clause to limit the output retrieved
List the comparison operators and logical operators that are used in a WHERE clause
Describe the rules of precedence for comparison and logical operators
Use character string literals in the WHERE clause
Write queries that contain an ORDER BY clause sort the output of a SELECT statement
Sort output in descending and ascending order
Using Single-Row Functions to Customize Output
Describe the differences between single row and multiple row functions
Manipulate strings with character function in the SELECT and WHERE clauses
Manipulate numbers with the ROUND, TRUNC and MOD functions
Perform arithmetic with date data
Manipulate dates with the date functions
Using Conversion Functions and Conditional Expressions
Describe implicit and explicit data type conversion
Use the TO_CHAR, TO_NUMBER, and TO_DATE conversion functions
Nest multiple functions
Apply the NVL, NULLIF, and COALESCE functions to data
Use conditional IF THEN ELSE logic in a SELECT statement
Reporting Aggregated Data Using the Group Functions
Use the aggregation functions in SELECT statements to produce meaningful reports
Create queries that
相关文档：
SQL 命令
这部分包含那些 PostgreSQL 支持的 SQL 命令的信息．这里的 "SQL" 就是该语言通常的含义； 每条命令的与标准有关的兼容性的信息可以在相关的参考页中找到．
Table of Contents
ABORT -- 退出当前事务
ALTER GROUP -- 向组中增加用户或从组中删除用户
ALTER USER -- 改变数� ......
现要求查询界面：不论15位或者18位身份证号都能查询出数据库中所有当前用户信息。
方案1：
create or replace function CONVERT_ID_15 (/*转换身份证号为15位*/
p_id2 in varchar2
) return varchar2
is
p_id varchar2(20);
id varchar2(15);
begin
p_id:=ltrim(p_id2);
p_id ......
Select * from tableName
exec('select * from tableName')
exec sp_executesql N'select * from tableName' -- 请注意字符串前一定要加N
2:字段名，表名，数据库名之类作为变量时，必须用动态SQL
declare @fname varchar(20)
set @fname = 'FiledName'
Select @fname from tableName -- 错误,不会提示错 ......
1 windows登录账户口：EXEC ap_grantlogin 'windows域名\域账户'
2 SQL 登录账户:EXEC sp_addlogin '账户名','密码'
3 创建数据库用户:exec spgrantdbaccess '登录账户','数据库用户'
二 给数据库用户授权
grant 权限 on 表名 to 数据库用户 ......
作者： sealyu 日期：2008-04-17
在SQL Server 中，如果给表的一个字段设置了默认值，就会在系统表sysobjects中生成一个默认约束。
如果想删除这个设置了默认值的字段（假设此字段名column1），
执行“ALTER TABLE table1 DROP COLUMN column1”时就会报错：
The object 'DF__xxxxxxxxxxx' ......
