oracle从入门到精通Word文档格式.docx
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oracle从入门到精通Word文档格式.docx
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1.2、数据库安全:
...............................................................................................................................8
1.3、基本的SQLSELECT语句.............................................................................................................8
1.4、SELECT语句...................................................................................................................................9
1、语法:
.......................................................................................................................................9
2、SQL语句说明:
.........................................................................................................................9
3、数字和日期都可以使用数学运算符建立表达式。
...............................................................9
4、定义空(NULL)值...................................................................................................................9
5、别名...........................................................................................................................................9
6、spool+路径...........................................................................................................................10
7、连接操作符:
||...................................................................................................................10
8、文本字符串.............................................................................................................................10
9、DISTINCT.................................................................................................................................10
1.5、SQLPLUS与SQL的关系...........................................................................................................10
1、SQLPLUS命令的功能:
...........................................................................................................10
2、查询SQLPLUS命令...............................................................................................................10
3、SQLPLUSW在WINDOWS下运行的分析器。
.........................................................................10
4、SQLPLUS命令:
.....................................................................................................................11
1.6、单行函数.....................................................................................................................................12
1、character字符类型函数:
...................................................................................................12
2、number数字类型函数.............................................................................................................15
3、时间类型函数:
(date).......................................................................................................15
1.7、嵌套函数:
..................................................................................................................................21
1.通用函数:
.......................................................................................................................21
2.条件表达式:
...................................................................................................................24
3.从多表中显示数据:
.......................................................................................................25
1.8、用字函数产生的总计.................................................................................................................26
1.9、子查询:
.....................................................................................................................................28
2.0、替换变量:
.................................................................................................................................29
1.&
.................................................................................................................................................29
2.&
&
...............................................................................................................................................29
2.1.环境变量:
...................................................................................................................................29
2.2格式化命令:
................................................................................................................................30
2.3做脚本文件的过程:
....................................................................................................................31
2.3数据操作语句:
............................................................................................................................31
1.插入..............................................
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