commit e1b7e64079d1aae7418979636618d8716d6cc385
Author: syneffort <syneffort@gmail.com>
Date:   Fri Sep 16 17:23:10 2022 +0900

    DDL

diff --git a/alter table add.sql b/alter table add.sql
new file mode 100644
index 0000000..aa2fae5
--- /dev/null
+++ b/alter table add.sql	
@@ -0,0 +1,5 @@
+use Study
+GO
+
+ALTER TABLE memberTest
+ADD pdate DATETIME
\ No newline at end of file
diff --git a/alter table alter.sql b/alter table alter.sql
new file mode 100644
index 0000000..7e3ed6c
--- /dev/null
+++ b/alter table alter.sql	
@@ -0,0 +1,5 @@
+USE Study
+GO
+
+ALTER TABLE memberTest
+ALTER COLUMN name varchar(30)
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diff --git a/alter table constraint.sql b/alter table constraint.sql
new file mode 100644
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--- /dev/null
+++ b/alter table constraint.sql	
@@ -0,0 +1,19 @@
+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
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diff --git a/create database.sql b/create database.sql
new file mode 100644
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--- /dev/null
+++ b/create database.sql	
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+USE master
+
+CREATE DATABASE Study
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diff --git a/create table with constraint.sql b/create table with constraint.sql
new file mode 100644
index 0000000..46bd0d2
--- /dev/null
+++ b/create table with constraint.sql	
@@ -0,0 +1,18 @@
+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')
\ No newline at end of file
diff --git a/create table with reference constraint.sql b/create table with reference constraint.sql
new file mode 100644
index 0000000..2d4704b
--- /dev/null
+++ b/create table with reference constraint.sql	
@@ -0,0 +1,13 @@
+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')
diff --git a/create table with table constraint.sql b/create table with table constraint.sql
new file mode 100644
index 0000000..92a7b26
--- /dev/null
+++ b/create table with table constraint.sql	
@@ -0,0 +1,10 @@
+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)
+)
\ No newline at end of file
diff --git a/create table.sql b/create table.sql
new file mode 100644
index 0000000..c55194b
--- /dev/null
+++ b/create table.sql	
@@ -0,0 +1,6 @@
+USE Study;
+GO
+CREATE TABLE memberTest(
+	id INT IDENTITY(1, 1),
+	name VARCHAR(20)
+)
\ No newline at end of file
diff --git a/insert tuple.sql b/insert tuple.sql
new file mode 100644
index 0000000..72b9941
--- /dev/null
+++ b/insert tuple.sql	
@@ -0,0 +1,5 @@
+USE Study
+GO
+
+INSERT INTO memberTest VALUES ('lee')
+INSERT INTO memberTest VALUES ('kim')
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diff --git a/select tuple.sql b/select tuple.sql
new file mode 100644
index 0000000..d0fe00b
--- /dev/null
+++ b/select tuple.sql	
@@ -0,0 +1,4 @@
+USE Study
+GO
+
+SELECT * FROM memberTest
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