如何 select 并计算同一查询中同一列中的3个元素并将它们显示在三列中？
How to select and count 3 elements in the same column in the same query and show them in three columns?
如何写一个查询而不是这三个？
感谢您的回答！
sqlCtx.sql("""Select count(*) as iPhone
from yahoo
where source like '%iphone%'
""").show()
sqlCtx.sql("""Select count(*) as Android
from yahoo
where source like '%android%'
""").show()
sqlCtx.sql("""Select count(*) as Web
from yahoo
where source like '%Web Client%'
""").show()
您需要尝试相同的条件，如果存在则加 1，否则加 0，这是示例：-
sqlCtx.sql("""
Select
sum(if source like '%iphone%', 1, 0) as Iphone,
sum(if source like '%android%', 1, 0) as Android,
sum(if source like '%Web Client%', 1, 0) as Web
from yahoo
""").show()
如何写一个查询而不是这三个？ 感谢您的回答！
sqlCtx.sql("""Select count(*) as iPhone
from yahoo
where source like '%iphone%'
""").show()
sqlCtx.sql("""Select count(*) as Android
from yahoo
where source like '%android%'
""").show()
sqlCtx.sql("""Select count(*) as Web
from yahoo
where source like '%Web Client%'
""").show()
您需要尝试相同的条件，如果存在则加 1，否则加 0，这是示例：-
sqlCtx.sql("""
Select
sum(if source like '%iphone%', 1, 0) as Iphone,
sum(if source like '%android%', 1, 0) as Android,
sum(if source like '%Web Client%', 1, 0) as Web
from yahoo
""").show()