From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | Celia McInnis <celia(dot)mcinnis(at)gmail(dot)com> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: How do I insert and update into a table of arrays of composite types via a select command? |
Date: | 2017-10-25 19:47:01 |
Message-ID: | 21511.1508960821@sss.pgh.pa.us |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-general |
Celia McInnis <celia(dot)mcinnis(at)gmail(dot)com> 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
From | Date | Subject | |
---|---|---|---|
Next Message | Rob Sargent | 2017-10-25 20:59:27 | query not scaling |
Previous Message | Celia McInnis | 2017-10-25 19:34:44 | How do I insert and update into a table of arrays of composite types via a select command? |