Poke around the infrastructure of any startup website or mobile app these days, and you’re bound to find something other than a relational database doing much of the heavy lifting. Take, for example, ...
( SELECT a,b,c FROM tbl WHERE x=:1 EXCEPT SELECT a,b,c FROM tbl WHERE x=:2 ) r For a table tbl with columns rowid,a,b,c,d,x ... Note: ":1" and ":2" are arguments (I'm using Perl DBI). Now, I would ...
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