Question: How can I create a table from another table without copying any values from the old table? Answer: To do this, the basic syntax is: CREATE TABLE new_table AS (SELECT * FROM old_table WHERE 1=2); For e
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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❯ ...
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 constraints...
图2-7-7 8.Change the name of column LNO to LOANNO 语句: alter table accounts rename LNO to LOANNO; 结果(图2-7-8): 图2-7-8 9.Create a view for use by personnel in department 30 showing employee name, number, job and hiredate 语句: create view view2017303010 as select ename,em...
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; ...
CREATETABLEbookshelf(BOOK_IDNUMBER,BOOK_NAMEVARCHAR2(100),BOOK_TYPEVARCHAR2(100),AUTHORVARCHAR2(100),INTIMEDATE); 表名为:bookshelf,有列:图书id,图书名称,图书类型,作者,入库时间。通过上面学习的SELECT语法,来查询一下这张表: SELECT * FROM bookshelf; ...
SELECT column, another_column, … FROM mytable WHERE condition(s) ORDER BY column ASC/DESC LIMIT num_limit OFFSET num_offset; 5.表格拼接 Remark:表先进行连接再进行select选择 建立如下所示表格: ex1: id label 1 A 2 B 3 C ex2: id label ...
CREATE EXTERNAL TABLE AS SELECT (CETAS) creates an external table and then exports, in parallel, the results of a T-SQL SELECT statement.
In Oracle database, the datatype for an integer column is represented as "number". In Sybase it is represented as "int".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 ...