{"id":26446,"date":"2024-10-27T10:52:42","date_gmt":"2024-10-27T10:52:42","guid":{"rendered":"http:\/\/atmokpo.com\/w\/?p=26446"},"modified":"2024-11-26T07:42:44","modified_gmt":"2024-11-26T07:42:44","slug":"%ec%8a%a4%ed%94%84%eb%a7%81-%eb%b6%80%ed%8a%b8-%eb%b0%b1%ec%97%94%eb%93%9c-%ea%b0%9c%eb%b0%9c-%ea%b0%95%ec%a2%8c-rdb%eb%9e%80","status":"publish","type":"post","link":"https:\/\/atmokpo.com\/w\/26446\/","title":{"rendered":"\uc2a4\ud504\ub9c1 \ubd80\ud2b8 \ubc31\uc5d4\ub4dc \uac1c\ubc1c \uac15\uc88c, RDB\ub780"},"content":{"rendered":"<p><body><\/p>\n<p>\uc624\ub298\uc740 \uc2a4\ud504\ub9c1 \ubd80\ud2b8\ub97c \ud65c\uc6a9\ud558\uc5ec \ubc31\uc5d4\ub4dc \uac1c\ubc1c\uc744 \ud560 \ub54c \ud544\uc218\uc801\uc73c\ub85c \uc54c\uc544\uc57c \ud558\ub294 \uad00\uacc4\ud615 \ub370\uc774\ud130\ubca0\uc774\uc2a4(RDB)\uc5d0 \ub300\ud574 \uc54c\uc544\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \ub370\uc774\ud130\ubca0\uc774\uc2a4\ub294 \uc18c\ud504\ud2b8\uc6e8\uc5b4 \ud504\ub85c\uc81d\ud2b8\uc5d0\uc11c \uac00\uc7a5 \uc911\uc694\ud55c \ubd80\ubd84 \uc911 \ud558\ub098\uc774\uba70, RDB\ub294 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \ubaa8\ub378\uc758 \ud558\ub098\ub85c \uc804 \uc138\uacc4\uc801\uc73c\ub85c \ub110\ub9ac \uc0ac\uc6a9\ub418\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uc774 \uae00\uc5d0\uc11c\ub294 RDB\uc758 \uac1c\ub150, \ud2b9\uc9d5, \uadf8\ub9ac\uace0 \uc2a4\ud504\ub9c1 \ubd80\ud2b8\uc640\uc758 \ud1b5\ud569 \ubc29\ubc95\uc5d0 \ub300\ud574 \uc790\uc138\ud788 \uc124\uba85\ud558\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n<h2>1. \uad00\uacc4\ud615 \ub370\uc774\ud130\ubca0\uc774\uc2a4(RDB)\ub780?<\/h2>\n<p>\uad00\uacc4\ud615 \ub370\uc774\ud130\ubca0\uc774\uc2a4\ub294 \ub370\uc774\ud130\ub97c \ud14c\uc774\ube14 \ud615\ud0dc\ub85c \uad6c\uc870\ud654\ud558\uc5ec \uc800\uc7a5\ud558\ub294 \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc785\ub2c8\ub2e4. \uac01 \ud14c\uc774\ube14\uc740 \ud589(row)\uacfc \uc5f4(column)\ub85c \uad6c\uc131\ub418\uc5b4 \uc788\uc73c\uba70, \ud14c\uc774\ube14 \uac04\uc758 \uad00\uacc4\ub97c \ud1b5\ud574 \ub370\uc774\ud130\ub97c \uc5f0\uacb0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. RDB\ub294 Structured Query Language(SQL)\uc744 \uc0ac\uc6a9\ud558\uc5ec \ub370\uc774\ud130\ub97c \uc815\uc758\ud558\uace0 \uc870\uc791\ud569\ub2c8\ub2e4.<\/p>\n<h3>1.1 RDB\uc758 \uc5ed\uc0ac<\/h3>\n<p>1960\ub144\ub300 \ucd08, \uc5d0\ub4dc\uac70 F. \ucf54\ub4dc(Edgar F. Codd)\uac00 \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc758 \uad00\uacc4 \ubaa8\ub378\uc744 \uc81c\uc548\ud558\uba74\uc11c RDB\uc758 \uae30\ucd08\uac00 \ub9c8\ub828\ub418\uc5c8\uc2b5\ub2c8\ub2e4. \uc774\ud6c4 1970\ub144\ub300\uc5d0 IBM\uc740 SQL\uc744 \uae30\ubc18\uc73c\ub85c \ud55c \uad00\uacc4\ud615 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uc2dc\uc2a4\ud15c\uc744 \uac1c\ubc1c\ud558\uc600\uace0, \uc774\ub294 RDBMS(Relational Database Management System)\uc758 \ubc1c\uc804\uc73c\ub85c \uc774\uc5b4\uc84c\uc2b5\ub2c8\ub2e4. \uc624\ub298\ub0a0, MySQL, PostgreSQL, Oracle Database, Microsoft SQL Server \ub4f1\uc758 \ub2e4\uc591\ud55c RDBMS\uac00 \uc0ac\uc6a9\ub418\uace0 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<h3>1.2 RDB\uc758 \uad6c\uc131\uc694\uc18c<\/h3>\n<ul>\n<li><strong>\ud14c\uc774\ube14 (Table):<\/strong> \ub370\uc774\ud130\uac00 \uc800\uc7a5\ub418\ub294 \uae30\ubcf8 \ub2e8\uc704\uc785\ub2c8\ub2e4. \uac01 \ud14c\uc774\ube14\uc740 \ud2b9\uc815 \uc8fc\uc81c\uc640 \uad00\ub828\ub41c \ub370\uc774\ud130\ub97c \ud3ec\ud568\ud569\ub2c8\ub2e4.<\/li>\n<li><strong>\ud589 (Row):<\/strong> \ud14c\uc774\ube14\uc758 \uac01 \ub370\uc774\ud130 \ub808\ucf54\ub4dc\ub97c \ub098\ud0c0\ub0c5\ub2c8\ub2e4. \uac01\uac01\uc758 \ud589\uc740 \ud2b9\uc815 \ub370\uc774\ud130\ub97c \ud45c\ud604\ud569\ub2c8\ub2e4.<\/li>\n<li><strong>\uc5f4 (Column):<\/strong> \uac01 \ud589\uc5d0 \uc18d\ud558\ub294 \uc18d\uc131\uc744 \uc815\uc758\ud569\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, \uc0ac\uc6a9\uc790 \ud14c\uc774\ube14\uc5d0\uc11c &#8216;\uc774\ub984&#8217;, &#8216;\uc774\uba54\uc77c&#8217; \ub4f1\uc774 \uc5f4\ub85c \uc815\uc758\ub420 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<li><strong>\uae30\ubcf8 \ud0a4 (Primary Key):<\/strong> \uac01 \ud589\uc744 \uace0\uc720\ud558\uac8c \uc2dd\ubcc4\ud558\ub294 \ud558\ub098\uc758 \uc5f4 \ub610\ub294 \uc5f4 \uc870\ud569\uc785\ub2c8\ub2e4.<\/li>\n<li><strong>\uc678\ub798 \ud0a4 (Foreign Key):<\/strong> \ub450 \ud14c\uc774\ube14 \uac04\uc758 \uad00\uacc4\ub97c \uc124\uc815\ud558\ub294 \uc5f4\uc785\ub2c8\ub2e4. \ub2e4\ub978 \ud14c\uc774\ube14\uc758 \uae30\ubcf8 \ud0a4\ub97c \ucc38\uc870\ud569\ub2c8\ub2e4.<\/li>\n<\/ul>\n<h2>2. RDB\uc758 \uc8fc\uc694 \ud2b9\uc9d5<\/h2>\n<p>\uad00\uacc4\ud615 \ub370\uc774\ud130\ubca0\uc774\uc2a4\ub294 \uc5ec\ub7ec \uac00\uc9c0 \ud2b9\uc9d5\uc744 \uac00\uc9c0\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ub7f0 \ud2b9\uc9d5\ub4e4\uc774 RDB\ub97c \ub370\uc774\ud130 \uad00\ub9ac\uc758 \ud45c\uc900\uc73c\ub85c \ub9cc\ub4e4\uc5b4\uc654\uc2b5\ub2c8\ub2e4.<\/p>\n<ul>\n<li><strong>\ub370\uc774\ud130 \ubb34\uacb0\uc131 (Data Integrity):<\/strong> \ub370\uc774\ud130\uc758 \uc815\ud655\uc131\uacfc \uc77c\uad00\uc131\uc744 \ubcf4\uc7a5\ud569\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, \uc678\ub798 \ud0a4 \uc81c\uc57d \uc870\uac74\uc744 \ud1b5\ud574 \ub370\uc774\ud130 \uad00\uacc4\uc758 \ubb34\uacb0\uc131\uc744 \uc720\uc9c0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<li><strong>\uc815\uaddc\ud654 (Normalization):<\/strong> \ub370\uc774\ud130\ub97c \uad6c\uc870\ud654\ud558\uc5ec \uc911\ubcf5\uc744 \ucd5c\uc18c\ud654\ud558\uace0, \ubb34\uacb0\uc131\uc744 \uc720\uc9c0\ud558\ub294 \uacfc\uc815\uc785\ub2c8\ub2e4.<\/li>\n<li><strong>ACID \uc18d\uc131 (ACID Properties):<\/strong> \ud2b8\ub79c\uc7ad\uc158\uc758 \uc6d0\uc790\uc131, \uc77c\uad00\uc131, \uaca9\ub9ac\uc131, \uc9c0\uc18d\uc131\uc744 \ubcf4\uc7a5\ud558\uc5ec \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc758 \uc548\uc815\uc131\uc744 \ub192\uc785\ub2c8\ub2e4.<\/li>\n<li><strong>SQL \uc9c0\uc6d0:<\/strong> SQL\uc744 \ud1b5\ud574 \ub370\uc774\ud130 \uc870\ud68c, \uc0bd\uc785, \uc218\uc815, \uc0ad\uc81c\ub97c \ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. SQL\uc740 \uad00\uacc4\ud615 \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc758 \ud45c\uc900 \ucffc\ub9ac \uc5b8\uc5b4\uc785\ub2c8\ub2e4.<\/li>\n<li><strong>\ube44\uc988\ub2c8\uc2a4 \uaddc\uce59 \uad6c\ud604:<\/strong> RDB\ub294 \ube44\uc988\ub2c8\uc2a4 \uaddc\uce59\uc744 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uc218\uc900\uc5d0\uc11c \uad6c\ud604\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, \ud2b9\uc815 \uc870\uac74\uc744 \ub9cc\uc871\ud558\ub294 \ub370\uc774\ud130\ub9cc\uc744 \uc785\ub825\ud558\ub3c4\ub85d \uc81c\uc57d\uc744 \uc124\uc815\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<\/ul>\n<h2>3. \uc2a4\ud504\ub9c1 \ubd80\ud2b8\uc640 RDB<\/h2>\n<p>\uc2a4\ud504\ub9c1 \ubd80\ud2b8\ub294 Java \uae30\ubc18\uc758 \ud504\ub808\uc784\uc6cc\ud06c\ub85c \ube60\ub974\uace0 \uc27d\uac8c \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \uac1c\ubc1c\ud560 \uc218 \uc788\ub3c4\ub85d \uc9c0\uc6d0\ud569\ub2c8\ub2e4. \uc774 \ud504\ub808\uc784\uc6cc\ud06c\ub294 RDBMS\uc640\uc758 \ud1b5\ud569\ub3c4 \uac04\ud3b8\ud558\uac8c \ucc98\ub9ac\ud560 \uc218 \uc788\uac8c \ud574 \uc90d\ub2c8\ub2e4. \uc2a4\ud504\ub9c1 \ubd80\ud2b8\ub97c \uc0ac\uc6a9\ud558\uc5ec RDB\uc5d0 \uc5f0\uacb0\ud558\ub294 \ubc29\ubc95\uc740 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4.<\/p>\n<h3>3.1 \uc2a4\ud504\ub9c1 \ubd80\ud2b8 \uc758\uc874\uc131 \ucd94\uac00<\/h3>\n<p>\uc2a4\ud504\ub9c1 \ubd80\ud2b8 \ud504\ub85c\uc81d\ud2b8\ub97c \ub9cc\ub4e4 \ub54c, \uc0ac\uc6a9\ud558\ub294 RDBMS\uc5d0 \ub9de\ub294 \uc758\uc874\uc131\uc744 `pom.xml` \ub610\ub294 `build.gradle` \ud30c\uc77c\uc5d0 \ucd94\uac00\ud574\uc57c \ud569\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, MySQL\uc744 \uc0ac\uc6a9\ud558\ub294 \uacbd\uc6b0 \ub2e4\uc74c\uacfc \uac19\uc740 \uc758\uc874\uc131\uc744 \ucd94\uac00\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<pre><code>\n<dependency>\n    <groupid>mysql<\/groupid>\n    <artifactid>mysql-connector-java<\/artifactid>\n    <version>8.0.26<\/version>\n<\/dependency>\n<\/code><\/pre>\n<h3>3.2 \ub370\uc774\ud130\uc18c\uc2a4 \uc124\uc815<\/h3>\n<p>\uc2a4\ud504\ub9c1 \ubd80\ud2b8\uc5d0\uc11c\ub294 <code>application.properties<\/code> \ud30c\uc77c\uc5d0 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uc5f0\uacb0\uc744 \uc704\ud55c \uc815\ubcf4\ub97c \uc124\uc815\ud574\uc57c \ud569\ub2c8\ub2e4. \ub2e4\uc74c\uc740 MySQL \ub370\uc774\ud130\ubca0\uc774\uc2a4\ub97c \uc124\uc815\ud558\ub294 \uc608\uc785\ub2c8\ub2e4.<\/p>\n<pre><code>\nspring.datasource.url=jdbc:mysql:\/\/localhost:3306\/your_database\nspring.datasource.username=your_username\nspring.datasource.password=your_password\nspring.jpa.hibernate.ddl-auto=update\nspring.jpa.show-sql=true\n<\/code><\/pre>\n<h3>3.3 \uc5d4\ud2f0\ud2f0 \ud074\ub798\uc2a4 \uc0dd\uc131<\/h3>\n<p>\ub370\uc774\ud130\ubca0\uc774\uc2a4 \ud14c\uc774\ube14\uc5d0 \ub9e4\ud551\ub418\ub294 \uc5d4\ud2f0\ud2f0 \ud074\ub798\uc2a4\ub97c \uc0dd\uc131\ud569\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4, \uc0ac\uc6a9\uc790 \uc815\ubcf4\ub97c \uc800\uc7a5\ud558\ub294 User \uc5d4\ud2f0\ud2f0\ub97c \ub2e4\uc74c\uacfc \uac19\uc774 \uc815\uc758\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<pre><code>\nimport javax.persistence.*;\n\n@Entity\n@Table(name = \"users\")\npublic class User {\n    \n    @Id\n    @GeneratedValue(strategy = GenerationType.IDENTITY)\n    private Long id;\n\n    @Column(name = \"username\")\n    private String username;\n\n    @Column(name = \"email\")\n    private String email;\n\n    \/\/ Getters and setters\n}\n<\/code><\/pre>\n<h3>3.4 \ub808\ud3ec\uc9c0\ud1a0\ub9ac \uc778\ud130\ud398\uc774\uc2a4 \uc0dd\uc131<\/h3>\n<p>\uc5d4\ud2f0\ud2f0\uc5d0 \ub300\ud55c CRUD(Create, Read, Update, Delete) \uc791\uc5c5\uc744 \ucc98\ub9ac\ud558\uae30 \uc704\ud574 Spring Data JPA\ub97c \uc0ac\uc6a9\ud558\uc5ec \ub808\ud3ec\uc9c0\ud1a0\ub9ac \uc778\ud130\ud398\uc774\uc2a4\ub97c \uc815\uc758\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<pre><code>\nimport org.springframework.data.jpa.repository.JpaRepository;\n\npublic interface UserRepository extends JpaRepository<user, long=\"\"> {\n    User findByUsername(String username);\n}\n<\/user,><\/code><\/pre>\n<h3>3.5 \uc11c\ube44\uc2a4 \ubc0f \ucee8\ud2b8\ub864\ub7ec \uc0dd\uc131<\/h3>\n<p>\ube44\uc988\ub2c8\uc2a4 \ub85c\uc9c1\uc744 \ucc98\ub9ac\ud558\uae30 \uc704\ud574 \uc11c\ube44\uc2a4 \ud074\ub798\uc2a4\ub97c \ub9cc\ub4e4\uace0, \uc774\ub97c \uc0ac\uc6a9\ud558\uc5ec RESTful API\ub97c \uc81c\uacf5\ud558\ub294 \ucee8\ud2b8\ub864\ub7ec\ub97c \uc0dd\uc131\ud569\ub2c8\ub2e4. \uc608\ub97c \ub4e4\uc5b4:<\/p>\n<pre><code>\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.web.bind.annotation.*;\n\nimport java.util.List;\n\n@RestController\n@RequestMapping(\"\/api\/users\")\npublic class UserController {\n\n    @Autowired\n    private UserService userService;\n\n    @GetMapping\n    public List<user> getAllUsers() {\n        return userService.getAllUsers();\n    }\n\n    @PostMapping\n    public User createUser(@RequestBody User user) {\n        return userService.createUser(user);\n    }\n\n    \/\/ Other methods\n}\n<\/user><\/code><\/pre>\n<h2>4. RDB\uc758 \uc0ac\uc6a9 \uc0ac\ub840<\/h2>\n<p>\uad00\uacc4\ud615 \ub370\uc774\ud130\ubca0\uc774\uc2a4\ub294 \ub2e4\uc591\ud55c \ubd84\uc57c\uc5d0\uc11c \uc0ac\uc6a9\ub418\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uba87 \uac00\uc9c0 \uc8fc\uc694 \uc0ac\uc6a9 \uc0ac\ub840\ub294 \ub2e4\uc74c\uacfc \uac19\uc2b5\ub2c8\ub2e4:<\/p>\n<ul>\n<li><strong>\ubcf4\uc548 \uad00\ub828 \ub370\uc774\ud130 \uae30\ub85d:<\/strong> \uc0ac\uc6a9\uc790\uc758 \uac1c\uc778 \uc815\ubcf4\ub098 \uac70\ub798 \uc815\ubcf4\ub97c \uc548\uc804\ud558\uace0 \uc815\ud655\ud558\uac8c \uc800\uc7a5\ud558\ub294 \ub370 \uc0ac\uc6a9\ub429\ub2c8\ub2e4.<\/li>\n<li><strong>eCommerce \uc0ac\uc774\ud2b8:<\/strong> \uc81c\ud488, \uace0\uac1d, \uc8fc\ubb38 \ub4f1\uc758 \ub2e4\uc591\ud55c \ub370\uc774\ud130\ub97c \uad00\uacc4\ud615 \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc5d0 \uc800\uc7a5\ud558\uc5ec \ud6a8\uc728\uc801\uc73c\ub85c \uad00\ub9ac\ud569\ub2c8\ub2e4.<\/li>\n<li><strong>\uc7ac\ubb34 \uad00\ub9ac:<\/strong> \uc138\uae08, \uc218\uc775 \ubc0f \uc9c0\ucd9c \uc815\ubcf4\ub97c \uad6c\uc870\uc801\uc73c\ub85c \uc800\uc7a5\ud558\uace0 \uad00\ub9ac\ud558\ub294 \ub370 \uc774\uc0c1\uc801\uc785\ub2c8\ub2e4.<\/li>\n<li><strong>\uc758\ub8cc \uae30\ub85d \uad00\ub9ac:<\/strong> \ud658\uc790\uc758 \uc758\ub8cc \uae30\ub85d \ubc0f \uce58\ub8cc \uc774\ub825\uc744 \ud6a8\uacfc\uc801\uc73c\ub85c \uad00\ub9ac\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<\/ul>\n<h2>5. \uacb0\ub860<\/h2>\n<p>RDB\ub294 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \uad00\ub9ac \uc2dc\uc2a4\ud15c\uc73c\ub85c\uc11c \ub370\uc774\ud130\uc758 \ubb34\uacb0\uc131\uacfc \uc77c\uad00\uc131\uc744 \uc720\uc9c0\ud558\uba74\uc11c \ud6a8\uc728\uc801\uc73c\ub85c \ub370\uc774\ud130\ub97c \uc800\uc7a5\ud558\uace0 \uad00\ub9ac\ud558\ub294 \ub370 \ub9e4\uc6b0 \uc720\uc6a9\ud569\ub2c8\ub2e4. \uc2a4\ud504\ub9c1 \ubd80\ud2b8\ub97c \uc0ac\uc6a9\ud558\uba74 \uad00\uacc4\ud615 \ub370\uc774\ud130\ubca0\uc774\uc2a4\uc640\uc758 \ud1b5\ud569\uc774 \uc26c\uc6cc\uc838, \ube60\ub974\uac8c \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \uac1c\ubc1c\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774 \uac15\uc88c\ub97c \ud1b5\ud574 RDB\uc758 \uac1c\ub150\uacfc \uc2a4\ud504\ub9c1 \ubd80\ud2b8\uc640\uc758 \ud1b5\ud569 \ubc29\ubc95\uc5d0 \ub300\ud55c \uc774\ud574\ub97c \ub192\uc77c \uc218 \uc788\uae30\ub97c \ubc14\ub78d\ub2c8\ub2e4.<\/p>\n<p><\/body><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\uc624\ub298\uc740 \uc2a4\ud504\ub9c1 \ubd80\ud2b8\ub97c \ud65c\uc6a9\ud558\uc5ec \ubc31\uc5d4\ub4dc \uac1c\ubc1c\uc744 \ud560 \ub54c \ud544\uc218\uc801\uc73c\ub85c \uc54c\uc544\uc57c \ud558\ub294 \uad00\uacc4\ud615 \ub370\uc774\ud130\ubca0\uc774\uc2a4(RDB)\uc5d0 \ub300\ud574 \uc54c\uc544\ubcf4\uaca0\uc2b5\ub2c8\ub2e4. \ub370\uc774\ud130\ubca0\uc774\uc2a4\ub294 \uc18c\ud504\ud2b8\uc6e8\uc5b4 \ud504\ub85c\uc81d\ud2b8\uc5d0\uc11c \uac00\uc7a5 \uc911\uc694\ud55c \ubd80\ubd84 \uc911 \ud558\ub098\uc774\uba70, RDB\ub294 \ub370\uc774\ud130\ubca0\uc774\uc2a4 \ubaa8\ub378\uc758 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