What happens if an INSERT trigger inserts something into another
table which also has a sequence ?
Using what, lastval()? The app will get very confused, because it'll
get the value from the sequence used in the trigger. Using currval
there is no problem, but you already knew that.
I knew but I forgot since I use an ORM which handles all the mess ;)
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
