例如我有这样的说法：
my name is Joseph and my father's name is Brian
该语句按单词拆分，如下表：
------------------------------
| ID | word |
------------------------------
| 1 | my |
| 2 | name |
| 3 | is |
| 4 | Joseph |
| 5 | and |
| 6 | my |
| 7 | father's |
| 8 | name |
| 9 | is |
| 10 | Brian |
------------------------------
我想获取每个单词的上一个和下一个单词
例如我想获取“name”的上一个和下一个单词：
--------------------------
| my | name | is |
--------------------------
| father's | name | is |
--------------------------
我怎样才能得到这个结果？
您没有指定您的 DBMS，因此以下是 ANSI SQL：
select prev_word, word, next_word
from (
select id,
lag(word) over (order by id) as prev_word,
word,
lead(word) over (order by id) as next_word
from words
) as t
where word = 'name';
SQLFiddle：http://sqlfiddle.com/#!12/7639e/1 http://sqlfiddle.com/#!12/7639e/1
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