关于“Loading Taxi Data into Google Cloud SQL 2.5”的评价

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JAYARAM P. · 已于 over 3 years前审核

It seems extraordinary to deal with table defs and similar DDL on a naked CLI. Probably more people would use a SQL client. Task 2 - #13 and Task 4 #2: Parentheses around the DISTINCT columns are unnecessary and perhaps misleading in so far as they may create the impression of a function (DISTINCT is not a function). Given: select distinct(pickup_location_id) from trips; Better: SELECT DISTINCT pickup_location_id FROM trips; Even better: SELECT COUNT(DISTINCT pickup_location_id) AS distinct_ids FROM trips; (Note that AS is optional - it's helpful for people who may be new to SQL)

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