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Sreng Hong15,083 Points
Should the query statement write in uppercase or lowercase?
I wonder why we should write the query statement in uppercase. Is it the best practice or something?
I think the both lowercase and uppercase query statement return the same result.
Carter Meyers3,236 Points
While the SQL keywords you're referring to are case-insensitive (FROM, SELECT, WHERE, ON, IN, AS, etc.), it is indeed common practice to capitalize these words. Combined with proper spacing and indenting, this practice will make your SQL statements much easier to read and refer back to later on.
Note: Unlike SQL keywords, table and database names are NOT case-insensitive. These require proper capitalization on most platforms you'll use.
If I'm just running a SQL query for myself on the fly, I don't tend to bother capitalising but if I'm writing something more formal like a report, I always capitalise the keywords and use all the correct spacing/indenting etc.