diff --git a/数据库/头歌/添加常用约束/添加常用约束.sh b/数据库/头歌/添加常用约束/添加常用约束.sh
new file mode 100644
index 0000000..2fc8cad
--- /dev/null
+++ b/数据库/头歌/添加常用约束/添加常用约束.sh
@@ -0,0 +1,9 @@
+sqlcmd -S localhost -U sa -P '<123123Aa!@>'
+CREATE DATABASE MyDb;
+go 
+
+USE MyDb;
+go
+
+CREATE TABLE t_user (id INT PRIMARY KEY IDENTITY(1,1), username VARCHAR(32) NOT NULL UNIQUE, sex INT DEFAULT 0);
+go