pySpark.sql如何使用WHERE关键字？

Question

您如何使用WHERE关键字来获得在泰坦尼克号灾难中幸存下来的性别及其百分比？

我的代码：

spark.sql(
    "SELECT Sex Where Survived=1 ,count(Sex) \
    as gender_count,count(sex)*100/sum(count(sex)) over() \
    as percent from titanic_table GROUP BY sex"
).show()

错误：

ParseException: "
mismatched input ',' expecting <EOF>(line 1, pos 28)
== SQL ==
SELECT Sex Where Survived=1 ,count(Sex) 
as gender_count,count(sex)*100/sum(count(sex)) over() 
as percent from titanic_table GROUP BY sex
----------------------------^^^
"

Answer 1

您应该将其放在FROM之后和GROUP BY之前。

您的代码应为：

spark.sql("SELECT Sex, count(Sex) AS gender_count, \
100*count(sex)/sum(count(sex)) over() AS percent \
FROM titanic_table \
WHERE Survived = 1 \
GROUP BY sex").show()