Where can marketers get secondary data from?

String sql=" delete from rizhi where data="+data;为什么总是报错,dat sql="select * from "&data&" where id="&myid&"" 在数据库中没有data 这 what can i get from where can a dog get another tail? what can we get from the sea? We can get water from a well. what can I get from my friend We can get books from the school ( ) I simply can not get away from Can't get files from server we can get m----- from the cow She can't get fun from it.