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><H1
><A
NAME="SQL-CREATECONSTRAINT"
>CREATE CONSTRAINT TRIGGER</A
></H1
><DIV
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><A
NAME="AEN38964"
></A
><H2
>Name</H2
> CREATE CONSTRAINT TRIGGER
-- define a new constraint trigger
</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN38967"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>CREATE CONSTRAINT TRIGGER <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
>
AFTER <TT
CLASS="REPLACEABLE"
><I
>events</I
></TT
> ON
<TT
CLASS="REPLACEABLE"
><I
>relation</I
></TT
> <TT
CLASS="REPLACEABLE"
><I
>constraint</I
></TT
> <TT
CLASS="REPLACEABLE"
><I
>attributes</I
></TT
>
FOR EACH ROW EXECUTE PROCEDURE <TT
CLASS="REPLACEABLE"
><I
>func</I
></TT
> '(' <TT
CLASS="REPLACEABLE"
><I
>args</I
></TT
> ')'
</PRE
><DIV
CLASS="REFSECT2"
><A
NAME="R2-SQL-CREATECONSTRAINT-1"
></A
><H3
> Inputs
</H3
><P
>
<P
></P
></P><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
></DT
><DD
><P
> The name of the constraint trigger.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>events</I
></TT
></DT
><DD
><P
> The event categories for which this trigger should be fired.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>relation</I
></TT
></DT
><DD
><P
> The name (possibly schema-qualified) of the relation in which
the triggering events occur.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>constraint</I
></TT
></DT
><DD
><P
> Actual constraint specification.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>attributes</I
></TT
></DT
><DD
><P
> Constraint attributes.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>func</I
></TT
>(<TT
CLASS="REPLACEABLE"
><I
>args</I
></TT
>)</DT
><DD
><P
> Function to call as part of the trigger processing.
</P
></DD
></DL
></DIV
><P>
</P
></DIV
><DIV
CLASS="REFSECT2"
><A
NAME="R2-SQL-CREATECONSTRAINT-2"
></A
><H3
> Outputs
</H3
><P
>
<P
></P
></P><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="COMPUTEROUTPUT"
>CREATE TRIGGER
</TT
></DT
><DD
><P
> Message returned if successful.
</P
></DD
></DL
></DIV
><P>
</P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="R1-SQL-CREATECONSTRAINT-1"
></A
><H2
> Description
</H2
><P
> <TT
CLASS="COMMAND"
>CREATE CONSTRAINT TRIGGER</TT
> is used within
<TT
CLASS="COMMAND"
>CREATE/ALTER TABLE</TT
> and by
<SPAN
CLASS="APPLICATION"
>pg_dump</SPAN
> to create the special triggers for
referential integrity.
</P
><P
> It is not intended for general use.
</P
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