我的表中有个字段 COL_B的内容要更新,原来的值为 COL_Brow1: "a,b,u,k,d,e,f"row2: "d,f,a,u,k"row3 "d,d,d,u,k,l"想把值中的"u,k"去掉,变成 COL_Brow1: "a,b,d,e,f"row2: "d,f,a"row3 "d,d,d,l"那位大神帮我一下吧