摘要：1、中软国际 SQL行转列变成 --数据准备create table t_test( year int, month int, sale int, primary key (year, month));insert into t_test values (1991, 1, 110);insert into t_test values (1991, 2, 120);insert into t_test values (1991, 3, 130);insert into t_test values (1991, 4, 140);insert into t_test valu... 阅读全文