%msg&sql(CREATEGLOBALTEMPORARYTABLETempEmp(EMPNUMINTNOTNULL,NAMELASTCHAR(30)NOTNULL,NAMEFIRSTCHAR(30)NOTNULL,CONSTRAINTEMPLOYEEPKPRIMARYKEY(EMPNUM)))ifSQLCODE=0{w!,"表创建"}else{w!,"SQLCODE=",SQLCODE,": ",%msg}}
创建这些表的 SQL 语句保存在示例\CreateTable\<rdbms 名="">文件夹下的CreateTable<表名>.sql文件中。例如在 >PostgreSQL 中创建Product表所使用的 SQL 语句,就保存在示例代码\CreateTable\PostgreSQL文件夹下的CreateTableProduct.sql文件中。 CreateTableProduct.sql文件包含了创建Product表时用到的 SQL 语句(代码...
CREATE TABLE AS SELECT FROM语句的语法 CREATE TABLE AS SELECT FROM语句的基本语法如下: CREATETABLEnew_table_nameASSELECTcolumn1,column2,...FROMsource_table_name; 1. 2. 3. 4. 在上面的语法中,new_table_name是你想要创建的新表的名称,column1、column2等是你想要选择的列的名称,source_table_name是...
第二十章 SQL命令 CREATE TABLE AS SELECT 将现有表中的列定义和列数据复制到新表中。 大纲 CREATE TABLE table-name AS query [shard-key] [WITH table-option] 参数 table-name 要创建的表的名称,指定为有效标识符。表名可以是限定的(schema.table),也可以是非限定的(Table)。未限定的表名采用缺省模式名...
要确定当前设置,请调用$SYSTEM.SQL.CurrentSettings()方法,该方法显示a Do classes created by a DDL CREATE TABLE statement define a bitmap extent index。 如果在创建位图索引后,对自动定义位图范围索引的表调用CREATE BITMAPEXTENT INDEX,则先前定义的位图范围索引将重命名为CREATE BITMAPEXTENT INDEX语句指定的...
Oracle provides another way of creating a table.CREATE TABLE temp_employee SELECT * FROM employee In the above statement, temp_employee table is created with the same number of columns and datatype as employee table. BookMark This Page ...
query_expression:SELECT... (Somevalidselectorunionstatement)CREATETABLEcreates atablewiththe given name. You must have theCREATEprivilegeforthetable.Bydefault, tables are createdinthedefaultdatabase, using the InnoDB storage engine. An error occursifthetableexists,ifthereisnodefaultdatabase,orifthedata...
-- create a backup table from the existing table CustomersCREATETABLECustomersBackupASSELECT*FROMCustomers; Run Code This SQL command creates the new table namedCustomersBackup, duplicating the structure of theCustomerstable. Note: You can choose to copy all or specific columns. ...
In SQL, the SELECT INTO statement is used to copy data from one table to another. Example -- copy all the contents of a table to a new table SELECT * INTO CustomersCopy FROM Customers; Here, the SQL command copies all data from the Customers table to the new CustomersCopy table. ...
SELECTcolumn1, column2,... FROMexisting_table_name WHERE...; The following SQL creates a new table called "TestTable" (which is a copy of the "Customers" table): Example CREATETABLETestTableAS SELECTcustomername, contactname FROMcustomers; Track...