postgres make a function that returns rows with composite type
0
I have 2 tables, A and B, I'd like to make a function that returns their natural join.
Here is a function that returns the entirety of table A
create function func() returns setof A as 'select * from A;' language sql;
I'd like to find a way to do their natural join, here is what I have so far:
create function func() returns setof A as 'select * from A natural join B;' language sql;
The problem is that the types don't match, what can I change so that the types match? Thanks
postgresql
asked Nov 15 '18 at 0:03
fredfred
453317
add a comment |
0
I have 2 tables, A and B, I'd like to make a function that returns their natural join.
Here is a function that returns the entirety of table A
create function func() returns setof A as 'select * from A;' language sql;
I'd like to find a way to do their natural join, here is what I have so far:
create function func() returns setof A as 'select * from A natural join B;' language sql;
The problem is that the types don't match, what can I change so that the types match? Thanks
postgresql
asked Nov 15 '18 at 0:03
fredfred
453317
1
1. Do you really need all those fields from both tables? 2. If you want a composite type, it will have to contain all the fields that are returned by the query. 3. You could also just do something likeRETURNS TABLE (field1 INTEGER, field2 TEXT, ...)to return all the fields you want without creating a composite type.
– 404
Nov 15 '18 at 0:08
what I want is to know in general how to determine the schema of the output of a function. This is just a particular example I came up with to demonstrate the problem.
– fred
Nov 15 '18 at 0:10
So, either create a composite type with all the returned fields, or return a TABLE with all the field names and types specified there, without creating a composite type.
– 404
Nov 15 '18 at 0:11
ok thanks, I'll try using TABLE as you mentioned
– fred
Nov 15 '18 at 0:12
add a comment |
0
0
0
I have 2 tables, A and B, I'd like to make a function that returns their natural join.
Here is a function that returns the entirety of table A
create function func() returns setof A as 'select * from A;' language sql;
I'd like to find a way to do their natural join, here is what I have so far:
create function func() returns setof A as 'select * from A natural join B;' language sql;
The problem is that the types don't match, what can I change so that the types match? Thanks
postgresql
asked Nov 15 '18 at 0:03
fredfred
453317
I have 2 tables, A and B, I'd like to make a function that returns their natural join.
Here is a function that returns the entirety of table A
create function func() returns setof A as 'select * from A;' language sql;
I'd like to find a way to do their natural join, here is what I have so far:
create function func() returns setof A as 'select * from A natural join B;' language sql;
The problem is that the types don't match, what can I change so that the types match? Thanks
postgresql
postgresql
asked Nov 15 '18 at 0:03
fredfred
453317
asked Nov 15 '18 at 0:03
fredfred
453317
asked Nov 15 '18 at 0:03
fredfred
453317
asked Nov 15 '18 at 0:03
fredfred
453317
asked Nov 15 '18 at 0:03
fredfred
453317
453317
1
1. Do you really need all those fields from both tables? 2. If you want a composite type, it will have to contain all the fields that are returned by the query. 3. You could also just do something likeRETURNS TABLE (field1 INTEGER, field2 TEXT, ...)to return all the fields you want without creating a composite type.
– 404
Nov 15 '18 at 0:08
what I want is to know in general how to determine the schema of the output of a function. This is just a particular example I came up with to demonstrate the problem.
– fred
Nov 15 '18 at 0:10
So, either create a composite type with all the returned fields, or return a TABLE with all the field names and types specified there, without creating a composite type.
– 404
Nov 15 '18 at 0:11
ok thanks, I'll try using TABLE as you mentioned
– fred
Nov 15 '18 at 0:12
add a comment |
1
1. Do you really need all those fields from both tables? 2. If you want a composite type, it will have to contain all the fields that are returned by the query. 3. You could also just do something likeRETURNS TABLE (field1 INTEGER, field2 TEXT, ...)to return all the fields you want without creating a composite type.
– 404
Nov 15 '18 at 0:08
what I want is to know in general how to determine the schema of the output of a function. This is just a particular example I came up with to demonstrate the problem.
– fred
Nov 15 '18 at 0:10
So, either create a composite type with all the returned fields, or return a TABLE with all the field names and types specified there, without creating a composite type.
– 404
Nov 15 '18 at 0:11
ok thanks, I'll try using TABLE as you mentioned
– fred
Nov 15 '18 at 0:12
1
1
1. Do you really need all those fields from both tables? 2. If you want a composite type, it will have to contain all the fields that are returned by the query. 3. You could also just do something like
RETURNS TABLE (field1 INTEGER, field2 TEXT, ...) to return all the fields you want without creating a composite type.– 404
Nov 15 '18 at 0:08
1. Do you really need all those fields from both tables? 2. If you want a composite type, it will have to contain all the fields that are returned by the query. 3. You could also just do something like
RETURNS TABLE (field1 INTEGER, field2 TEXT, ...) to return all the fields you want without creating a composite type.– 404
Nov 15 '18 at 0:08
what I want is to know in general how to determine the schema of the output of a function. This is just a particular example I came up with to demonstrate the problem.
– fred
Nov 15 '18 at 0:10
what I want is to know in general how to determine the schema of the output of a function. This is just a particular example I came up with to demonstrate the problem.
– fred
Nov 15 '18 at 0:10
So, either create a composite type with all the returned fields, or return a TABLE with all the field names and types specified there, without creating a composite type.
– 404
Nov 15 '18 at 0:11
So, either create a composite type with all the returned fields, or return a TABLE with all the field names and types specified there, without creating a composite type.
– 404
Nov 15 '18 at 0:11
ok thanks, I'll try using TABLE as you mentioned
– fred
Nov 15 '18 at 0:12
ok thanks, I'll try using TABLE as you mentioned
– fred
Nov 15 '18 at 0:12
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function ()
StackExchange.using("externalEditor", function ()
StackExchange.using("snippets", function ()
StackExchange.snippets.init();
);
);
, "code-snippets");
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "1"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53310600%2fpostgres-make-a-function-that-returns-rows-with-composite-type%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
draft saved
draft discarded
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
draft saved
draft discarded
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53310600%2fpostgres-make-a-function-that-returns-rows-with-composite-type%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
1
1. Do you really need all those fields from both tables? 2. If you want a composite type, it will have to contain all the fields that are returned by the query. 3. You could also just do something like
RETURNS TABLE (field1 INTEGER, field2 TEXT, ...)to return all the fields you want without creating a composite type.– 404
Nov 15 '18 at 0:08
what I want is to know in general how to determine the schema of the output of a function. This is just a particular example I came up with to demonstrate the problem.
– fred
Nov 15 '18 at 0:10
So, either create a composite type with all the returned fields, or return a TABLE with all the field names and types specified there, without creating a composite type.
– 404
Nov 15 '18 at 0:11
ok thanks, I'll try using TABLE as you mentioned
– fred
Nov 15 '18 at 0:12