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>dblink_build_sql_delete</H1
><DIV
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><A
NAME="AEN147834"
></A
><H2
>Name</H2
>dblink_build_sql_delete&nbsp;--&nbsp;builds a DELETE statement using supplied values for primary
    key field values
   </DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN147837"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>dblink_build_sql_delete(text relname,
                        int2vector primary_key_attnums,
                        integer num_primary_key_atts,
                        text[] tgt_pk_att_vals_array) returns text</PRE
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NAME="AEN147839"
></A
><H2
>Description</H2
><P
>    <CODE
CLASS="FUNCTION"
>dblink_build_sql_delete</CODE
> can be useful in doing selective
    replication of a local table to a remote database.  It builds a SQL
    <TT
CLASS="COMMAND"
>DELETE</TT
> command that will delete the row with the given
    primary key values.
   </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN147844"
></A
><H2
>Arguments</H2
><P
></P
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CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="PARAMETER"
>relname</TT
></DT
><DD
><P
>       Name of a local relation, for example <TT
CLASS="LITERAL"
>foo</TT
> or
       <TT
CLASS="LITERAL"
>myschema.mytab</TT
>.  Include double quotes if the
       name is mixed-case or contains special characters, for
       example <TT
CLASS="LITERAL"
>"FooBar"</TT
>; without quotes, the string
       will be folded to lower case.
      </P
></DD
><DT
><TT
CLASS="PARAMETER"
>primary_key_attnums</TT
></DT
><DD
><P
>       Attribute numbers (1-based) of the primary key fields,
       for example <TT
CLASS="LITERAL"
>1 2</TT
>.
      </P
></DD
><DT
><TT
CLASS="PARAMETER"
>num_primary_key_atts</TT
></DT
><DD
><P
>       The number of primary key fields.
      </P
></DD
><DT
><TT
CLASS="PARAMETER"
>tgt_pk_att_vals_array</TT
></DT
><DD
><P
>       Values of the primary key fields to be used in the resulting
       <TT
CLASS="COMMAND"
>DELETE</TT
> command.  Each field is represented in text form.
      </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN147872"
></A
><H2
>Return Value</H2
><P
>Returns the requested SQL statement as text.</P
></DIV
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CLASS="REFSECT1"
><A
NAME="AEN147875"
></A
><H2
>Notes</H2
><P
>    As of <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> 9.0, the attribute numbers in
    <TT
CLASS="PARAMETER"
>primary_key_attnums</TT
> are interpreted as logical
    column numbers, corresponding to the column's position in
    <TT
CLASS="LITERAL"
>SELECT * FROM relname</TT
>.  Previous versions interpreted the
    numbers as physical column positions.  There is a difference if any
    column(s) to the left of the indicated column have been dropped during
    the lifetime of the table.
   </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN147881"
></A
><H2
>Examples</H2
><PRE
CLASS="SCREEN"
>SELECT dblink_build_sql_delete('"MyFoo"', '1 2', 2, '{"1", "b"}');
           dblink_build_sql_delete
---------------------------------------------
 DELETE FROM "MyFoo" WHERE f1='1' AND f2='b'
(1 row)</PRE
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