David Wheeler <david@kineticode.com> writes:
> No, you can have multiple queries--you just have to understand that
> those that come first might have an effect on those that come later.

.... which indeed can be a feature, not a bug, depending on what you're
doing ...

regards, tom lane

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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match