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27 lines
989 B
SQL
27 lines
989 B
SQL
-- Tạo bảng mà không có ràng buộc
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CREATE TABLE IF NOT EXISTS user_roles (
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user_id UUID NOT NULL,
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role_id INTEGER NOT NULL,
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created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
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PRIMARY KEY (user_id, role_id)
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);
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-- Tạo index cho hiệu suất truy vấn tốt hơn
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CREATE INDEX idx_user_roles_user_id ON user_roles(user_id);
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CREATE INDEX idx_user_roles_role_id ON user_roles(role_id);
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-- Thêm ràng buộc khóa ngoại nếu bảng tồn tại
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DO $$
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BEGIN
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IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'users') THEN
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ALTER TABLE user_roles ADD CONSTRAINT fk_user_roles_user
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FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE;
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END IF;
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IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'roles') THEN
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ALTER TABLE user_roles ADD CONSTRAINT fk_user_roles_role
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FOREIGN KEY (role_id) REFERENCES roles(id) ON DELETE CASCADE;
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END IF;
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END
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$$;
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