Merge branch 'database'

+CREATE TABLE USER(
+ID int(10) NOT NULL AUTO_INCREMENT PRIMARY KEY,
+EMAIL varchar(64) NOT NULL UNIQUE,
+NICKNAME varchar(32) NOT NULL UNIQUE,
+AGE int(16),
+GENDER varchar(32)
+);
+
+CREATE TABLE REVIEW(
+ID int(10) NOT NULL AUTO_INCREMENT PRIMARY KEY,
+CAFE_ID int(10) NOT NULL,
+PRICE int(10) NOT NULL,
+KINDNESS int(10) NOT NULL,
+NOISE int(10) NOT NULL,
+ACCESSIBILITY int(10) NOT NULL
+);
+
+CREATE TABLE PREFERENCE(
+ID int(10) NOT NULL AUTO_INCREMENT PRIMARY KEY,
+NICKNAME varchar(32) NOT NULL  UNIQUE,
+PRICE int(10) NOT NULL,
+KINDNESS int(10) NOT NULL,
+NOISE int(10) NOT NULL,
+ACCESSIBILITY int(10) NOT NULL,
+FOREIGN KEY(NICKNAME) REFERENCES USER(NICKNAME) ON DELETE CASCADE
+);
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