R sqldf parsing/case when 语句不支持的字符

Question

R 由于 sqldf 中不支持的字符而给我一个错误，例如当我输入以下内容时：

sqldf("select *, 
case symptom
when 'Bell's palsy' or 'Facial pain' or 'Facial paralysis' then 'neuropathy'
end as Adverse_event from data")

错误是由于"'"中贝尔的字。有什么工作可以绕过这个错误吗？并且还正确地捕获了数据中的这种情况。

Answer 1

您应该能够在查询中将单引号撇号加倍，例如

sql <- "select *, case symptom
                      when 'Bell''s palsy' then 'neuropathy'
                      when 'Facial pain' then 'neuropathy' 
                      when 'Facial paralysis' then 'neuropathy'
                  end as Adverse_event
        from data"
result <- sqldf(sql)

不过，我会在这里使用 WHERE IN (...)：

sql <- "SELECT *, CASE WHEN symptom IN ('Bell''s palsy', 'Facial pain', 'Facial paralysis')
                       THEN 'neuropathy' END AS Adverse_event
        FROM data"
sqldf(data)

R sqldf parsing/case when 语句不支持的字符

R sqldf parsing/case when statement for unsupported characters

r

sqldf