Question

如果你有两个不同的单词，你怎么得到一个单词之后的子字符串？我希望在'是'和'不是'之后的子字符串。假设我有如下列。如何在单个查询中的'is'和'is not'之后抓取子字符串？我创建了另一个列并具有空值。我只想要一列而没有空值

"bob is very cool"
"Cris isn't cool"

SELECT SUBSTR(String, INDEX_OF(String,'isnt'),strlen(string)) as column2, 
SUBSTR(String,INDEX_OF(String,'is'),STRLEN(String)) as column1 from 
'[LOGFILEPATH]' where column2 <> null or column1 <>null

预期结果

 "very cool"
 "cool"

Answer 1

使用INSTR查找关键字的位置。

select case when instr(test_string,'isn''t') > 0           
            then substr(test_string,
                 instr(test_string,'isn''t')+5,
                 length(test_string))
            when instr(test_string,' is ') > 0           
            then substr(test_string,
                 instr(test_string,' is ')+4,
                 length(test_string))
            else null
        end as stringAftKeyWord
from table

Answer 2

如果你知道你需要什么词，你可以做一个Case语句。

SELECT 'bob is very cool' AS whoIsCool INTO #temp
INSERT INTO #temp VALUES ('Cris isn''t cool')
SELECT * FROM #temp

SELECT 
    CASE
       WHEN whoIsCool like '%is %' THEN
           SUBSTRING(whoIsCool, CHARINDEX('is', whoIsCool) + LEN('is'), CHARINDEX('is', whoIsCool) + LEN(whoIsCool))
       WHEN whoIsCool like '%isn''t%' THEN
           SUBSTRING(whoIsCool, CHARINDEX('isn''t', whoIsCool) + LEN('isn''t'), CHARINDEX('isn''t', whoIsCool) + LEN(whoIsCool))
    END as newCool
FROM #temp
DROP TABLE #temp

另外，你应该使用CONTAINS（）而不是通配符（就像我在这里）。

Sql在一个不同的单词后面的一个列中获取子字符串

2 个答案: