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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 -- builds a DELETE statement using supplied values for primary
key field values
</DIV
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CLASS="REFSYNOPSISDIV"
><A
NAME="AEN147837"
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><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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><A
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
><DIV
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
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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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