今天使用SQL Server联机丛书时无意中发现了一条SQL语句,竟然非常方便的解决了这个问题。这个语句就是INSERT语句。 INSERT语句在帮助中的定义是这样的: INSERT [ INTO] { table_name WITH ( < table_hint_limited > [ ...n ] ) | view_name | rowset_function_limited } {[ ( column_list ) ] { VALU...
insert into 表名(列名,列名,列名,列名) values (值,值,值,值),(值,值,值,值),(值,值,值,值); insert into tb_student(stu_name,stu_age,stu_gender,stu_address) values('赵六',28,'男','北京'),('马七',25,'女','成都'); 1. 2. 删除 全部删除: delete from 表名; 带条件的删除 :...
WHEN NOT MATCHED THEN INSERT VALUES (T.ID, T.OWNER, T.OBJECT_NAME, T.OBJECT_TYPE);--常见错误,连接条件不能获得稳定的行,可以使用下面的用子查询 MERGE INTO T1 USING (SELECT OWNER, OBJECT_NAME, MAX(ID) ID from T GROUP BY OWNER, OBJECT_NAME) T ON (T.OWNER = T1.OWNER AND T.OBJECT_...
A correlated subquery is a query that depends on the outer query for its values. This query can be executed repeatedly, one time for each row that could be selected by the outer query. The first example shows queries that are semantically equivalent to illustrate the difference between using ...
SQL SERVER中SELECT和SET赋值相同点与不同点 SELECT和SET在SQL SERVER中都可以用来对变量进行赋值,但其用法和效果在一些细节上有些不同。 1. 在对变量赋值方面,SET是ANSI标准的赋值方式,SELECT则不是。这也是SET方式被推荐使用的原因之一。 2. SELECT可以一次对多个变量进行赋值,而SET一次只能对一个变量赋值。
SELECTstatements are permitted in user-defined functions only if the select lists of these statements contain expressions that assign values to variables that are local to the functions. A four-part name constructed with theOPENDATASOURCEfunction as the server-name part can be used as a table sourc...
4. Insert both from columns and defined values. In case you insert data into multiple columns, but only some columns need to import from the table_b, some columns need to import from another set of data: INSERT INTO table_a (col1a, col2a, col3a, col4a …) ...
values(emp_seq1.nextval,'张三'); select*fromemp1; 3. 索引:提高查询效率 自动创建:Oracle 会为具有唯一约束(唯一约束,主键约束)的列,自动创建索引 create table emp2( id number(10) primary key, name varchar2(30) ) 手动创建 create index emp_idx ...
示例如下: select * into A from B 2.insert into select 语句:注意:(1)要求目标表B必须存在,并且字段field,field1...也必须存在(2)注意...B的主键约束,如果B有主键而且不为空,则 field1, field2...中必须包括主键(3)注意语法,不要加values,和插入一条数据的sql混了,不要写成:insert into B (field...
[Map-Value], dm.map_keyAS[Map-Key]FROMsys.dm_xe_objectsASdoJOINsys.dm_xe_object_columnsASdcONdc.object_name = do.nameJOINsys.dm_xe_map_valuesASdmONdm.name = dc.type_nameJOINsys.dm_xe_packagesASdpONdp.guid = do.package_guidWHEREdo.object_type ='event'ANDdo.name ='\<YOUR-EVENT-...