DDL

alter table add.sql

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+use Study
+GO
+
+ALTER TABLE memberTest
+ADD pdate DATETIME

alter table alter.sql

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+USE Study
+GO
+
+ALTER TABLE memberTest
+ALTER COLUMN name varchar(30)

alter table constraint.sql

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+USE Study
+GO
+
+CREATE TABLE orders5(
+	oseq INT IDENTITY(1, 1),
+	quantity VARCHAR(20) NULL,
+	indate DATETIME NULL,
+	id VARCHAR(20),
+	pcode VARCHAR(20)
+)
+
+ALTER TABLE orders5
+ADD CONSTRAINT PK_oseq5 PRIMARY KEY (oseq)
+
+ALTER TABLE orders5
+ADD CONSTRAINT FK_id5 FOREIGN KEY (id) REFERENCES customer(id)
+
+ALTER TABLE orders5
+DROP CONSTRAINT FK_id5

create database.sql

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+USE master
+
+CREATE DATABASE Study

create table with constraint.sql

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+USE Study
+GO
+
+CREATE TABLE customer(
+	id VARCHAR(20) CONSTRAINT PK_id PRIMARY KEY,
+	pwd VARCHAR(20) CONSTRAINT NN_pwd NOT NULL,
+	name VARCHAR(20) CONSTRAINT NN_name NOT NULL,
+	phone1 VARCHAR(3) NULL,
+	phone2 VARCHAR(8) NULL,
+	birthYear INT NULL,
+	address VARCHAR(100) NULL
+)
+
+INSERT INTO customer
+VALUES('one', '1111', 'Kim', '010', '1234567', 1988, 'Seoul')
+
+INSERT INTO customer
+VALUES('two', '2222', 'Lee', '010', '8910111', 1978, 'Incheon')

create table with reference constraint.sql

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+USE Study
+GO
+
+CREATE TABLE orders(
+	oseq int IDENTITY(1, 1) CONSTRAINT PK_oseq PRIMARY KEY,
+	quantity VARCHAR(20) NULL,
+	indate DATETIME NULL,
+	id VARCHAR(20) CONSTRAINT FK_id REFERENCES customer(id)
+)
+
+INSERT INTO orders(quantity, id) VALUES(5, 'one')
+
+INSERT INTO orders(quantity, id) VALUES(5, 'test')

create table with table constraint.sql

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+USE Study
+GO
+
+CREATE TABLE costomer3(
+	name VARCHAR(20),
+	phone VARCHAR(11),
+	birthday DATETIME,
+	address VARCHAR(100),
+	CONSTRAINT COMBO_PK_customer3 PRIMARY KEY(name, phone)
+)

create table.sql

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+USE Study;
+GO
+CREATE TABLE memberTest(
+	id INT IDENTITY(1, 1),
+	name VARCHAR(20)
+)

insert tuple.sql

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+USE Study
+GO
+
+INSERT INTO memberTest VALUES ('lee')
+INSERT INTO memberTest VALUES ('kim')

select tuple.sql

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+USE Study
+GO
+
+SELECT * FROM memberTest