STATA preserve restore交替配合使用 

preserve
keep in 1/1048575
save d:\te\安徽1,replace
restore
preserve
keep in 1048576/2000000
save d:\te\安徽2,replace
restore
keep in 2000000/2583957
save d:\te\安徽3,replace

 

posted @ 2023-08-31 10:21  myrj  阅读(513)  评论(0)    收藏  举报