like_pattern = f"_{search_term}%"# 第二个字符开始。like_pattern = f"%{search_term}%"# 包含。like_pattern = f"{search_term}%"# 开头。like_pattern = f"%{search_term}"# 结尾。like_pattern = "%XYZ"# 无法使用索引，全表扫描。like_patte