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Clarify that cross-row constraints are unsupported

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Maybe we'll implement them later, or maybe not, but let's make the statu
quo clear for now.

Author: Lætitia Avrot, Patrick Francelle
Reviewers: too many to list
Discussion: https://postgr.es/m/CAB_COdhUuzNFOJfc7SNNso5rOuVA3ui93KMVunEM8Yih+K5A6A@mail.gmail.com
This commit is contained in:
Alvaro Herrera
2018-11-26 12:27:07 -03:00
parent 664f01b613
commit 36d442a25a
2 changed files with 29 additions and 1 deletions
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3
doc/src/sgml/ref/create_table.sgml
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@@ -754,7 +754,8 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
<para>
Currently, <literal>CHECK</literal> expressions cannot contain
subqueries nor refer to variables other than columns of the
current row. The system column <literal>tableoid</literal>
current row (see <xref linkend="ddl-constraints-check-constraints"/>).
The system column <literal>tableoid</literal>
may be referenced, but not any other system column.
</para>