Split column into multiple rows in Postgres
Suppose I have a table like this:
subject | flag
----------------+------
this is a test | 2
subject is of type text, and flag is of type int. I would like to transform this table to something like this in Postgres:
token | flag
----------------+------
this | 2
is | 2
a | 2
test | 2
Is there an easy way to do this?
sql postgresql split set-returning-functions
edited Apr 2 '15 at 18:59
Erwin Brandstetter
348k68635813
asked Apr 2 '15 at 18:31
mgoldwassermgoldwasser
5,15383972
add a comment |
Suppose I have a table like this:
subject | flag
----------------+------
this is a test | 2
subject is of type text, and flag is of type int. I would like to transform this table to something like this in Postgres:
token | flag
----------------+------
this | 2
is | 2
a | 2
test | 2
Is there an easy way to do this?
sql postgresql split set-returning-functions
edited Apr 2 '15 at 18:59
Erwin Brandstetter
348k68635813
asked Apr 2 '15 at 18:31
mgoldwassermgoldwasser
5,15383972
add a comment |
Suppose I have a table like this:
subject | flag
----------------+------
this is a test | 2
subject is of type text, and flag is of type int. I would like to transform this table to something like this in Postgres:
token | flag
----------------+------
this | 2
is | 2
a | 2
test | 2
Is there an easy way to do this?
sql postgresql split set-returning-functions
edited Apr 2 '15 at 18:59
Erwin Brandstetter
348k68635813
asked Apr 2 '15 at 18:31
mgoldwassermgoldwasser
5,15383972
Suppose I have a table like this:
subject | flag
----------------+------
this is a test | 2
subject is of type text, and flag is of type int. I would like to transform this table to something like this in Postgres:
token | flag
----------------+------
this | 2
is | 2
a | 2
test | 2
Is there an easy way to do this?
sql postgresql split set-returning-functions
sql postgresql split set-returning-functions
edited Apr 2 '15 at 18:59
Erwin Brandstetter
348k68635813
asked Apr 2 '15 at 18:31
mgoldwassermgoldwasser
5,15383972
edited Apr 2 '15 at 18:59
Erwin Brandstetter
348k68635813
asked Apr 2 '15 at 18:31
mgoldwassermgoldwasser
5,15383972
edited Apr 2 '15 at 18:59
Erwin Brandstetter
348k68635813
edited Apr 2 '15 at 18:59
Erwin Brandstetter
348k68635813
edited Apr 2 '15 at 18:59
Erwin Brandstetter
348k68635813
348k68635813
asked Apr 2 '15 at 18:31
mgoldwassermgoldwasser
5,15383972
asked Apr 2 '15 at 18:31
mgoldwassermgoldwasser
5,15383972
asked Apr 2 '15 at 18:31
mgoldwassermgoldwasser
5,15383972
5,15383972
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
In Postgres 9.3+ use a LATERAL join:
SELECT s.token, flag
FROM tbl t, unnest(string_to_array(t.subject, ' ')) s(token)
WHERE flag = 2;
Note that the shorthand form of a LATERAL join only returns rows, if unnest() actually returns row(s).
You could also use regexp_split_to_table(), but that's typically slower because regular expression matching costs a bit more.
Related:
- SQL select rows containing substring in text field
- PostgreSQL unnest() with element number
edited May 23 '17 at 12:25
Community♦
11
answered Apr 2 '15 at 18:34
Erwin BrandstetterErwin Brandstetter
348k68635813
add a comment |
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
});
}
});
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%2f29419993%2fsplit-column-into-multiple-rows-in-postgres%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
In Postgres 9.3+ use a LATERAL join:
SELECT s.token, flag
FROM tbl t, unnest(string_to_array(t.subject, ' ')) s(token)
WHERE flag = 2;
Note that the shorthand form of a LATERAL join only returns rows, if unnest() actually returns row(s).
You could also use regexp_split_to_table(), but that's typically slower because regular expression matching costs a bit more.
Related:
- SQL select rows containing substring in text field
- PostgreSQL unnest() with element number
edited May 23 '17 at 12:25
Community♦
11
answered Apr 2 '15 at 18:34
Erwin BrandstetterErwin Brandstetter
348k68635813
add a comment |
In Postgres 9.3+ use a LATERAL join:
SELECT s.token, flag
FROM tbl t, unnest(string_to_array(t.subject, ' ')) s(token)
WHERE flag = 2;
Note that the shorthand form of a LATERAL join only returns rows, if unnest() actually returns row(s).
You could also use regexp_split_to_table(), but that's typically slower because regular expression matching costs a bit more.
Related:
- SQL select rows containing substring in text field
- PostgreSQL unnest() with element number
edited May 23 '17 at 12:25
Community♦
11
answered Apr 2 '15 at 18:34
Erwin BrandstetterErwin Brandstetter
348k68635813
add a comment |
In Postgres 9.3+ use a LATERAL join:
SELECT s.token, flag
FROM tbl t, unnest(string_to_array(t.subject, ' ')) s(token)
WHERE flag = 2;
Note that the shorthand form of a LATERAL join only returns rows, if unnest() actually returns row(s).
You could also use regexp_split_to_table(), but that's typically slower because regular expression matching costs a bit more.
Related:
- SQL select rows containing substring in text field
- PostgreSQL unnest() with element number
edited May 23 '17 at 12:25
Community♦
11
answered Apr 2 '15 at 18:34
Erwin BrandstetterErwin Brandstetter
348k68635813
In Postgres 9.3+ use a LATERAL join:
SELECT s.token, flag
FROM tbl t, unnest(string_to_array(t.subject, ' ')) s(token)
WHERE flag = 2;
Note that the shorthand form of a LATERAL join only returns rows, if unnest() actually returns row(s).
You could also use regexp_split_to_table(), but that's typically slower because regular expression matching costs a bit more.
Related:
- SQL select rows containing substring in text field
- PostgreSQL unnest() with element number
edited May 23 '17 at 12:25
Community♦
11
answered Apr 2 '15 at 18:34
Erwin BrandstetterErwin Brandstetter
348k68635813
edited May 23 '17 at 12:25
Community♦
11
edited May 23 '17 at 12:25
Community♦
11
edited May 23 '17 at 12:25
Community♦
11
11
answered Apr 2 '15 at 18:34
Erwin BrandstetterErwin Brandstetter
348k68635813
answered Apr 2 '15 at 18:34
Erwin BrandstetterErwin Brandstetter
348k68635813
answered Apr 2 '15 at 18:34
Erwin BrandstetterErwin Brandstetter
348k68635813
348k68635813
add a comment |
add a comment |
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.
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%2f29419993%2fsplit-column-into-multiple-rows-in-postgres%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
