It is important to note that when creating a table in this way, the new table will be populated with the records from the existing table (based on the SELECT Statement). Syntax #1 - Copying all columns from another table The basic syntax is: CREATE TABLE new_table AS (SELECT * FROM ol...
[code]INSERT anothertable(another_first,another_second) VALUES(@@identity,’some value’) 如果表mytable有一个标识字段,该字段的值会被插入表anothertable的another_first字段。这是因为变量@@identity总是保存最后一次插入标识字段的值。 字段another_first应该与字段first_column有相同的数据类型。但是,字段another...
CREATE TABLE Using Another TableA copy of an existing table can also be created using CREATE TABLE.The following SQL creates a new table called "TestTables" (which is a copy of the "Customers" table): Example CREATE TABLE TestTable ASSELECT customername, contactnameFROM customers; ...
CREATE TABLE Using Another Table The following SQL creates a new table called "TestTables" (which is a copy of two columns of the "Customers" table): Example CREATETABLETestTableAS SELECTcustomername, contactname FROMcustomers; ❮Previous❮ SQL KeywordsReferenceNext❯ ...
-- Creates a Delta table>CREATETABLEstudent (idINT,nameSTRING, ageINT);-- Use data from another table>CREATETABLEstudent_copyASSELECT*FROMstudent;-- Creates a CSV table from an external directory>CREATETABLEstudentUSINGCSV LOCATION'/path/to/csv_files';-- Specify table comment and prope...
The following example shows how to reference this key from another table; an explicit constraint name is optional. SQL Copy CONSTRAINT FK_SpecialOfferProduct_SalesOrderDetail FOREIGN KEY (ProductID, SpecialOfferID) REFERENCES SpecialOfferProduct (ProductID, SpecialOfferID) C. Use UNIQUE constrai...
方式一:insert into table_name (column_name...) values (value1...) 方式二:insert into table_name (column_name1...) select * from another_table_name DCL:data control language 数据控制语言 负责数据完整性,安全性的定义与检查以及并发控制,故障恢复等功能 ...
Create Table Using Another Existing Table In SQL, we can create a new table by duplicating an existing table's structure. Let's look at an example. -- create a backup table from the existing table CustomersCREATETABLECustomersBackupASSELECT*FROMCustomers; ...
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 ...
IFNOTEXISTS(SELECT*FROMsys.tablestINNERJOINsys.schemas sONt.schema_id=s.schema_idWHEREs.name='my_schema_name'ANDt.name='table_name')CREATETABLEtable_name(column_name data_type); MySQL CREATE TABLE IF NOT EXISTS To create a table if it does not exist in MySQL, you simply add IF NOT EX...