存储过程中，怎么把多个select结果，合并成一个结果集返回？
select userid,username,price,vol from table_a ...
select userid,username,price,vol from table_b...
要让这两句形成一个结果集。怎么办？
[解决办法]
select userid,username,price,vol from table_a ...
union all
select userid,username,price,vol from table_b...
[解决办法]
select userid,username,price,vol from table_a ...union all--不去掉上下两语句的重复行select userid,username,price,vol from table_b...select userid,username,price,vol from table_a ...union--去掉上下两语句的重复行select userid,username,price,vol from table_b...
[解决办法]
select userid,username,price,vol from table_a ...
union all
select userid,username,price,vol from table_b...
