1DBLINK_BUILD_SQL_DELETE(3)PostgreSQL 13.3 DocumentatioDnBLINK_BUILD_SQL_DELETE(3)
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NAME

6       dblink_build_sql_delete - builds a DELETE statement using supplied
7       values for primary key field values
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SYNOPSIS

10       dblink_build_sql_delete(text relname,
11                               int2vector primary_key_attnums,
12                               integer num_primary_key_atts,
13                               text[] tgt_pk_att_vals_array) returns text
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DESCRIPTION

16       dblink_build_sql_delete can be useful in doing selective replication of
17       a local table to a remote database. It builds a SQL DELETE command that
18       will delete the row with the given primary key values.
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ARGUMENTS

21       relname
22           Name of a local relation, for example foo or myschema.mytab.
23           Include double quotes if the name is mixed-case or contains special
24           characters, for example "FooBar"; without quotes, the string will
25           be folded to lower case.
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27       primary_key_attnums
28           Attribute numbers (1-based) of the primary key fields, for example
29           1 2.
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31       num_primary_key_atts
32           The number of primary key fields.
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34       tgt_pk_att_vals_array
35           Values of the primary key fields to be used in the resulting DELETE
36           command. Each field is represented in text form.
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RETURN VALUE

39       Returns the requested SQL statement as text.
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NOTES

42       As of PostgreSQL 9.0, the attribute numbers in primary_key_attnums are
43       interpreted as logical column numbers, corresponding to the column's
44       position in SELECT * FROM relname. Previous versions interpreted the
45       numbers as physical column positions. There is a difference if any
46       column(s) to the left of the indicated column have been dropped during
47       the lifetime of the table.
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EXAMPLES

50           SELECT dblink_build_sql_delete('"MyFoo"', '1 2', 2, '{"1", "b"}');
51                      dblink_build_sql_delete
52           ---------------------------------------------
53            DELETE FROM "MyFoo" WHERE f1='1' AND f2='b'
54           (1 row)
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58PostgreSQL 13.3                      2021           DBLINK_BUILD_SQL_DELETE(3)
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