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Doc: improve introductory information about procedures.

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Clarify the discussion in "User-Defined Procedures", by laying out
the key differences between functions and procedures in a bulleted
list.  Notably, this avoids burying the lede about procedures being
able to do transaction control.  Make the back-link in the CREATE
FUNCTION reference page more prominent, and add one in CREATE
PROCEDURE.

Per gripe from Guyren Howe.  Thanks to David Johnston for discussion.

Discussion: https://postgr.es/m/BYAPR03MB4903C53A8BB7EFF5EA289674A6949@BYAPR03MB4903.namprd03.prod.outlook.com
This commit is contained in:
Tom Lane
2021-03-10 11:33:50 -05:00
parent 3ebc6d2957
commit 227338b00d
3 changed files with 59 additions and 21 deletions
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5
doc/src/sgml/ref/create_procedure.sgml
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@@ -76,6 +76,11 @@ CREATE [ OR REPLACE ] PROCEDURE
To be able to create a procedure, you must have <literal>USAGE</literal>
privilege on the argument types.
</para>
<para>
Refer to <xref linkend="xproc"/> for further information on writing
procedures.
</para>
</refsect1>
<refsect1>