Question

表格上的字段名称

对于名称“name1”的给定值，给我那行以及之前的N行和之后的N行（按字母顺序排列）

Answer 1

在两个select语句中是否用你想要的N替换了数字5并更改了表名，这样就可以了。同样用正确的列名替换星号。如果您对此有任何问题，请告诉我。

  select * from 
    (
        Select *
        ,row_number() over (order by firstname desc) as 'rowNumber'
        from attendees
    ) as temp
where rowNumber between 
 (
    select rownumber-1 
    from 
        (
            Select *, row_number() over (order by firstname desc) as 'rowNumber'
            from attendees
        ) as temp
    where firstname = 'name1')  AND (
    select rownumber+1 
    from 
        (
            Select *, row_number() over (order by firstname desc) as 'rowNumber'
            from attendees
        ) as temp
    where firstname = 'name1')

Answer 2

以下内容为您提供name ='name4'的行，此前的两行以及之后的两行。

drop table t;

create table t(
   name varchar(20)
  ,primary key(name)
);

insert into t(name) values('name1');
insert into t(name) values('name2');
insert into t(name) values('name3');
insert into t(name) values('name4');
insert into t(name) values('name5');
insert into t(name) values('name6');
insert into t(name) values('name7');

commit;

(select name from t where name = 'name4')
  union all
(select name from t where name > 'name4' order by name asc  limit 2)
  union all
(select name from t where name < 'name4' order by name desc limit 2);


 +-------+
 | name  |
 +-------+
 | name1 |
 | name2 |
 | name4 |
 | name5 |
 | name6 |
 +-------+

编辑：按照cyberkiwi的指示增加了降序（否则我会在错误的一端得到“第一”2项）。

这可以在一个SQL查询中完成吗？

2 个答案: