【多选题】下列SQL语句在实际运行时,可能转换的SQL语句为() update user <set> <if test="uname!=null">uname=#{uname}, </if> <if test="usex!=null">usex=#{usex}</if> </set> where uid=#{uid} A. update user set uname=#{uname} where uid=#{uid} B. update user set uname=#{uname}, usex=#{usex} where uid=#{uid} C. update user usex=#{usex} where uid=#{uid} D. update user set uname=#{uname}, usex=#{usex}