create temporary table temp_t(id int primary key, a int, b int, index(b))engine=innodb; insert into temp_t select * from t2 where b>=1 and b<=2000; select * from t1 join temp_t on (t1.b=temp_t.b); 1. 2. 3. 这样执行过程就变成: 1、执行 insert 语句构造 temp_t 表并插入...
-- 用于创建一个新的数据表 CREATE TABLE table_name( column1 datatype, column2 datatype, column3 datatype, ... columnN datatype, PRIMARY KEY( one or more columns ) ); 在创建数据表时,可以使用 CREATE TABLE 语句指定约束规则;创建数据表以后,也可以使用 ALTER TABLE 语句来增加约束规则。 SQL 常...
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,...
简单的 CREATE TABLE 语法(如果不使用选项,则很常见): syntaxsql 复制 CREATE TABLE { database_name.schema_name.table_name | schema_name.table_name | table_name } ( { <column_definition> } [ ,... n ] ) [ ; ] 完整语法 基于磁盘的 CREATE TABLE 语法: syntaxsql 复制 CREATE TABLE {...
1、创建临时表:create table #temp(column_1 varchar(16),column_2 varchar(16)) 2、创建实体表:create table table_name() 3、复制实体表:select * into newTableName from oldTableName 对虚表进行备份:select * into newTableName from #temp /* 创建学生表、教师表、课程表、成绩表 学生表:学号(主键...
IF Object_id('Tempdb..#dl') IS NOT NULL DROP TABLE #dl --如果有存在就删除临时表 CREATE TABLE #dl (neirong char(20),icount int, dlzonjine int, dlshu int, dlyin int) --重建临时表 INSERT INTO #dl SELECT * FROM tab1 --把物理表的数据插到临时表 ...
Insert the rows from the results of the SELECT statement If row insertion fails, the temporary table will exist, but it will be empty. If you don’t want that to happen, use explicit transactions. SELECT INTO Temp Table Examples
簡單CREATE TABLE 語法 (如果沒有使用選項則通用): syntaxsql 複製 CREATE TABLE { database_name.schema_name.table_name | schema_name.table_name | table_name } ( { <column_definition> } [ ,... n ] ) [ ; ] 完整語法 磁碟型 CREATE TABLE 語法: syntaxsql 複製 CREATE TABLE { database...
If a temporary table is created with a named constraint and the temporary table is created within the scope of a user-defined transaction, only one user at a time can execute the statement that creates the temp table. For example, if a stored procedure creates a temporary table with a name...
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