You cannot create a non-clustered index on a table variable, unless the index is a side effect of a PRIMARY KEY or UNIQUE constraint on the table (SQL Server enforces any UNIQUE or PRIMARY KEY constraints using
5: create table #table (empidint, empname varchar (25),Department varchar (25) ,Salaryint) 6: create clustered index #table_index1 on #table (empid asc ) 7: create nonclustered index #table_index2 on #table (Salary) include (Department,empid ) 8: insert into #table select S.empid,...
TSQL–临时表和表变量 1. 临时表适用数据量较大的情况,因为临时表可以建立索引 2. 表变量适用于数据较小的情况,表变量只能在定义时创建约束(PRIMARY KEY/UNIQUE)从而间接建立索引 3. 临时表是事务性的,数据会随着事务回滚而回滚,表变量是非事务性的 4. 临时表和表变量都存放在内存中,当内存存在压力时才放入...
用下面的 T-SQL 语句建立一个基本表:CREATE TABLE Student ( Sno CHAR ( 4) PRIMARY KEY,Sname CHAR ( 8)
“职工号”为主关键字,建立“教师表”的SQL命令是A.CREATE TABLE教师表(职工号C(10)PRIMARY,姓名c(20),工龄I)B.CREATE TABLE教师表(职工号C(10)FOREIGN,姓名c(20),工龄I)C.CREATE TABLE教师表(职工号C(10)FOREIGN KEY,姓名c(20),工龄I)D.CREATE TABLE教师表(职工号c(10)PRIMARY KEY,姓名C(20),...
Feature FOREIGN KEY Applies to: Azure SQL Database and SQL Server starting SQL Server 2016 (13.x)For memory-optimized tables, FOREIGN KEY constraints are only supported for foreign keys referencing primary keys of other memory-optimized tables. Remove the constraint from the table definition if th...
SQL ServerForum Discussion yachaoh001 Copper ContributorMay 04, 2023 The primary key field of the SQLSERVER2016 table is UUID. Variable parameter passing causes a full t For example, table1 column id is the primary key, varchar(22), ID is prefixed by N by default during parame...
DataModificationTableReference DataRetentionTableOption DataTypeReference DataTypeSequenceOption DbccCommand DbccNamedLiteral DbccOption DbccOptionKind DbccStatement DeallocateCursorStatement DeclareCursorStatement DeclareTableVariableBody DeclareTableVariableStatement DeclareVariableElement DeclareVariableStatement DefaultConstrai...
DataModificationTableReference DataRetentionTableOption DataTypeReference DataTypeSequenceOption DbccCommand DbccNamedLiteral DbccOption DbccOptionKind DbccStatement DeallocateCursorStatement DeclareCursorStatement DeclareTableVariableBody DeclareTableVariableStatement DeclareVariableElement DeclareVariableStatement ...
An example of using the aforementioned enhancements is to have several processes waiting for a DELETE statement to delete at least one row from a table, directing the output to a table variable, with each processing different portions of the data in parallel. To witness this, create the followi...