issue_comments: 496039483

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https://github.com/simonw/datasette/issues/485#issuecomment-496039483 https://api.github.com/repos/simonw/datasette/issues/485 496039483 MDEyOklzc3VlQ29tbWVudDQ5NjAzOTQ4Mw== 9599 2019-05-26T23:22:53Z 2019-05-26T23:22:53Z OWNER

Comparing these two SQL queries (the one with union and the one without) using explain:

With union: https://latest.datasette.io/fixtures?sql=explain+select+%27name%27+as+column%2C+count+%28distinct+name%29+as+count_distinct%2C+avg%28length%28name%29%29+as+avg_length+from+roadside_attractions%0D%0A++union%0D%0Aselect+%27address%27+as+column%2C+count%28distinct+address%29+as+count_distinct%2C+avg%28length%28address%29%29+as+avg_length+from+roadside_attractions produces 52 rows

Without union: https://latest.datasette.io/fixtures?sql=explain+select%0D%0A++count+(distinct+name)+as+count_distinct_column_1%2C%0D%0A++avg(length(name))+as+avg_length_column_1%2C%0D%0A++count(distinct+address)+as+count_distinct_column_2%2C%0D%0A++avg(length(address))+as+avg_length_column_2%0D%0Afrom+roadside_attractions produces 32 rows

So I'm going to use the one without the union.

 
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