ALTER TABLE hw2_slide_tag MODIFY COLUMN dzi_level int(11) DEFAULT NULL;
ALTER TABLE hw2_slide_tag MODIFY COLUMN top_left_x int(11) DEFAULT NULL;
ALTER TABLE hw2_slide_tag MODIFY COLUMN top_left_y int(11) DEFAULT NULL;
ALTER TABLE hw2_slide_tag MODIFY COLUMN bottom_right_x int(11) DEFAULT NULL;
ALTER TABLE hw2_slide_tag MODIFY COLUMN bottom_right_y int(11) DEFAULT NULL;
ALTER TABLE hw2_slide_tag MODIFY COLUMN image_url varchar(1024) DEFAULT NULL;
CREATE INDEX tag_name_idx ON hw2_tag (name);
CREATE INDEX tag_slide_idx ON hw2_slide_tag (slide_id);
CREATE INDEX tag_fk_idx ON hw2_slide_tag (tag_id);