sqlite
    
    >
    
     
    
    create
    
     
    
    table
    
     t2 ( ...
    
    >
    
     id1 
    
    int
    
    ,...
    
    >
    
     id2 
    
    >
    
     col 
    
    varchar
    
    (
    
    20
    
    ),255)">constraint
    
     pk_t2 
    
    primary
    
     
    
    key
    
     (id1,id2) ...
    
    >
    
     ); sqlite
    
    >
   
   
   
   

    
     
   
   
   
   

    
    如果是双主键如下： 
    
    
    
    
sqlite> create table t1 (
   ...>         id      int primary key,...>         col     varchar(20)
   ...> );
sqlite> create unique index uk_t1 on t1 (col);