-- Add google_id column to users table
ALTER TABLE users ADD COLUMN IF NOT EXISTS google_id VARCHAR(255) DEFAULT NULL AFTER email;

-- Add columns to students table (if not already exist)
ALTER TABLE students ADD COLUMN IF NOT EXISTS email VARCHAR(255) DEFAULT NULL AFTER name_en;
ALTER TABLE students ADD COLUMN IF NOT EXISTS password VARCHAR(255) DEFAULT NULL AFTER email;
ALTER TABLE students ADD COLUMN IF NOT EXISTS google_id VARCHAR(255) DEFAULT NULL AFTER password;
ALTER TABLE students ADD COLUMN IF NOT EXISTS advisor_id INT DEFAULT NULL AFTER curriculum_id;
ALTER TABLE students ADD COLUMN IF NOT EXISTS previous_qualification VARCHAR(255) DEFAULT NULL AFTER graduated_institution;