Doing INTERSECT and MINUS in MySQL Doing an INTERSECT An INTERSECT is simply an inner join where we compare the tuples of one table with those of the other, and select those that appear in both while
oracle中有case语句;该语句可以把表达式结果同提供的几个可预见的结果作比较,如果比较成功,则执行对应的语句序列,语法为“CASE 表达式 WHEN 表达式结果1 THEN 执行项[WHEN 表达式结果 oracle中有case语句;该语句可以把表达式结果同提供的几个可预见的结果作比较,如果比较成功,则执行对应的语句序列,语法为“CASE 表达式 WHEN 表达式结果1 THEN 执行项[W