添加组合主键

create table xlfkzz_cs
(
xlfkzz01 varchar(20),
xlfkzz02 varchar(20) not null,
xlfkzz03 datetime not null,
xlfkzz04 varchar(20)
)
go

alter table xlfkzz_cs
add constraint pk_xlfkzz_cs primary key (xlfkzz02,xlfkzz03)
go