Declaring functions

Define a function for counting reviews given a user name:

1. create function review_count(name: str) -> int64
2. using (
3. with module default
4. select count(
5. (
6. select Review
7. filter .author.name = name
8. )
9. )
10. )

Drop a user-defined function:

1. drop function review_count(name: str);

Define and use polymorphic function:

1. db>
2. ...

1. create function make_name(name: str) -> str
2. using ('my_name_' ++ name);

1. CREATE FUNCTION

1. db>
2. ...

1. create function make_name(name: int64) -> str
2. using ('my_name_' ++ <str>name);

1. CREATE FUNCTION

1. q>

1. select make_name('Alice');

1. {'my_name_Alice'}

1. q>

1. select make_name(42);

1. {'my_name_42'}

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