Celia McInnis <celia.mcinnis@xxxxxxxxx> writes:
> My first question is: HOW do I populate this table, at first with arrays
> containing one element from the t_composite table?
> I have tried various things with no success.
You didn't say what you tried, but I imagine it was something like
regression=# insert into t_array select array[row('a','b','c'),row('d','e','f')];
ERROR: column "data_array" is of type mytype[] but expression is of type record[]
LINE 1: insert into t_array select array[row('a','b','c'),row('d','e...
^
HINT: You will need to rewrite or cast the expression.
Like it says, you need a cast. You can either cast the array elements
individually:
regression=# insert into t_array select array[row('a','b','c')::mytype,row('d','e','f')::mytype];
INSERT 0 1
or just cast the whole ARRAY[] construct:
regression=# insert into t_array select array[row('a','b','c'),row('d','e','f')]::mytype[];
INSERT 0 1
although I think the latter only works in relatively late-model
Postgres, and it might make parsing a bit slower too.
regards, tom lane
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