('1')可以写为 '1'
QuotedStr('F')给字符串两端加引号。
QuotedStr('F')给字符串两端加引号。
解决方案 »
- 請幫忙看一下,爲什麽程序不能執行到這一步?
- ADOQUERY模糊查询的sql语句应该怎写
- 只用delphi代码能不能读出硬盘的物理序列号?
- 继续昨天的问题:怎样用代码关闭 Explorer 浏览器?而不是关机
- qrmemo中的打印在protrait的设置中能正常换行打印,但是当为landscape的时候确出现换行后也换页了? 应该怎么解决呢?
- 大家好!请问各位大侠,如何在SQL中对时间字段进行查询???
- 寻找链表结构
- 为什么我的D7里面没有ExcelApplication,ExcelWorkbook和ExcelWorksheet
- 在把数据存入数据库里的表里时如何判断表里以存在了一条同样的记录并做出提示?
- 操作TRichEdit的问题,请帮忙?
- TreeView问题
- CREATE procedure TableExists (@tablename varchar(20))
{ [ ALTER COLUMN column_name
{ new_data_type [ ( precision [ , scale ] ) ]
[ COLLATE < collation_name > ]
[ NULL | NOT NULL ]
| {ADD | DROP } ROWGUIDCOL }
]
| ADD
{ [ < column_definition > ]
| column_name AS computed_column_expression
} [ ,...n ]
| [ WITH CHECK | WITH NOCHECK ] ADD
{ < table_constraint > } [ ,...n ]
| DROP
{ [ CONSTRAINT ] constraint_name
| COLUMN column } [ ,...n ]
| { CHECK | NOCHECK } CONSTRAINT
{ ALL | constraint_name [ ,...n ] }
| { ENABLE | DISABLE } TRIGGER
{ ALL | trigger_name [ ,...n ] }
}< column_definition > ::=
{ column_name data_type }
[ [ DEFAULT constant_expression ] [ WITH VALUES ]
| [ IDENTITY [ ( seed , increment ) [ NOT FOR REPLICATION ] ] ]
]
[ ROWGUIDCOL ]
[ COLLATE < collation_name > ]
[ < column_constraint > ] [ ...n ]< column_constraint > ::=
[ CONSTRAINT constraint_name ]
{ [ NULL | NOT NULL ]
| [ { PRIMARY KEY | UNIQUE }
[ CLUSTERED | NONCLUSTERED ]
[ WITH FILLFACTOR = fillfactor ]
[ ON { filegroup | DEFAULT } ]
]
| [ [ FOREIGN KEY ]
REFERENCES ref_table [ ( ref_column ) ]
[ ON DELETE { CASCADE | NO ACTION } ]
[ ON UPDATE { CASCADE | NO ACTION } ]
[ NOT FOR REPLICATION ]
]
| CHECK [ NOT FOR REPLICATION ]
( logical_expression )
}< table_constraint > ::=
[ CONSTRAINT constraint_name ]
{ [ { PRIMARY KEY | UNIQUE }
[ CLUSTERED | NONCLUSTERED ]
{ ( column [ ,...n ] ) }
[ WITH FILLFACTOR = fillfactor ]
[ ON { filegroup | DEFAULT } ]
]
| FOREIGN KEY
[ ( column [ ,...n ] ) ]
REFERENCES ref_table [ ( ref_column [ ,...n ] ) ]
[ ON DELETE { CASCADE | NO ACTION } ]
[ ON UPDATE { CASCADE | NO ACTION } ]
[ NOT FOR REPLICATION ]
| DEFAULT constant_expression
[ FOR column ] [ WITH VALUES ]
| CHECK [ NOT FOR REPLICATION ]
( search_conditions )
}2.
*=是左连接!一般是左表数据要多于右表数据,它以左表数据为准,显示,如果右表没有与之对应数据,则右表取空值!
=========================
*************************YYYY YYYY*************************
=========================
是窗体打开时的数据,
当你对表有修改,增加,删除时,在对应的按钮中的
click事件中用:
FormActivate(nil);
就可以随时显示最新的数据了
2。可以通过query的filter过滤
2FormActivate(nil);
就可以随时显示最新的数据了
3
楼上所说的,还有代表所有的
4('1')可以写为 '1'
QuotedStr('F')给字符串两端加引号看看书把