49 lines
1.1 KiB
SQL
49 lines
1.1 KiB
SQL
CREATE TABLE test_customer (
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Id NUMBER(6,0),
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Name VARCHAR2(20)
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);
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INSERT INTO test_Customer (Id, Name) VALUES (100,'SMITH');
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INSERT INTO test_Customer (Id, Name) VALUES (101,'JONES');
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INSERT INTO test_Customer (Id, Name) VALUES (100,'BROWN');
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SELECT * FROM test_customer;
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--TRUNCATE TABLE test_customer;
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DROP TABLE test_customer;
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CREATE TABLE test_customer (
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Id NUMBER(6,0) PRIMARY KEY,
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Name VARCHAR2(20)
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);
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DROP TABLE IF EXISTS test_customer;
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CREATE TABLE test_customer (
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Id NUMBER(6,0),
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Name VARCHAR2(20),
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CONSTRAINT test_customer_Id_pk PRIMARY KEY (Id)
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);
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-- Viewing the Data Dictionary
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SELECT table_name, num_rows FROM USER_TABLES WHERE table_name != 'HTMLDB_PLAN_TABLE';
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-- Table Creation through Sub Queries
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CREATE TABLE cust_marketing AS
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(SELECT Id, Lastname, FirstName, City, Province FROM Customers);
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SELECT * FROM cust_marketing;
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-- Modify Existing Tables
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ALTER TABLE Vendors ADD Ext NUMBER(4,0);
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ALTER TABLE VENDORS MODIFY Ext NUMBER(5,0);
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ALTER TABLE vendors DROP COLUMN Ext;
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SELECT table_name, num_rows FROM user_tables
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WHERE table_name != 'HTMLDB_PLAN_TABLE';
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