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'\" t
.\" Title: dblink_build_sql_delete
.\" Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\" Date: 2024
.\" Manual: PostgreSQL 15.7 Documentation
.\" Source: PostgreSQL 15.7
.\" Language: English
.\"
.TH "DBLINK_BUILD_SQL_DELETE" "3" "2024" "PostgreSQL 15.7" "PostgreSQL 15.7 Documentation"
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.nh
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.SH "NAME"
dblink_build_sql_delete \- builds a DELETE statement using supplied values for primary key field values
.SH "SYNOPSIS"
.sp
.nf
dblink_build_sql_delete(text relname,
int2vector primary_key_attnums,
integer num_primary_key_atts,
text[] tgt_pk_att_vals_array) returns text
.fi
.SH "DESCRIPTION"
.PP
\fBdblink_build_sql_delete\fR
can be useful in doing selective replication of a local table to a remote database\&. It builds an SQL
\fBDELETE\fR
command that will delete the row with the given primary key values\&.
.SH "ARGUMENTS"
.PP
\fIrelname\fR
.RS 4
Name of a local relation, for example
foo
or
myschema\&.mytab\&. Include double quotes if the name is mixed\-case or contains special characters, for example
"FooBar"; without quotes, the string will be folded to lower case\&.
.RE
.PP
\fIprimary_key_attnums\fR
.RS 4
Attribute numbers (1\-based) of the primary key fields, for example
1 2\&.
.RE
.PP
\fInum_primary_key_atts\fR
.RS 4
The number of primary key fields\&.
.RE
.PP
\fItgt_pk_att_vals_array\fR
.RS 4
Values of the primary key fields to be used in the resulting
\fBDELETE\fR
command\&. Each field is represented in text form\&.
.RE
.SH "RETURN VALUE"
.PP
Returns the requested SQL statement as text\&.
.SH "NOTES"
.PP
As of
PostgreSQL
9\&.0, the attribute numbers in
\fIprimary_key_attnums\fR
are interpreted as logical column numbers, corresponding to the column\*(Aqs position in
SELECT * FROM relname\&. 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\&.
.SH "EXAMPLES"
.sp
.if n \{\
.RS 4
.\}
.nf
SELECT dblink_build_sql_delete(\*(Aq"MyFoo"\*(Aq, \*(Aq1 2\*(Aq, 2, \*(Aq{"1", "b"}\*(Aq);
dblink_build_sql_delete
\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
DELETE FROM "MyFoo" WHERE f1=\*(Aq1\*(Aq AND f2=\*(Aqb\*(Aq
(1 row)
.fi
.if n \{\
.RE
.\}
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