环境准备CREATE TABLE scores id INTsubject VARCHAR(50)score IN);INSERT INTO scores (id, subject, scor ... 阅读全文
max+decode或case函数SELECT deptnoMAX(DECODE(ename, 'SMITH', sal)) AS SMITHMAX(DECODE(ename, 'ALLE ... 阅读全文
简介在sqlplus,如果列比较多,往往会显示不够清晰,这时如果能把查询语句行转列就明了多了,可以用print_table存储过程实现。存储过程PRINT_TABLE源码CREATE OR REPLA ... 阅读全文