1DBLINK_BUILD_SQL_DELETE(3)PostgreSQL 15.4 DocumentatioDnBLINK_BUILD_SQL_DELETE(3)
2
6 dblink_build_sql_delete - builds a DELETE statement using supplied
7 values for primary key field values
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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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16 dblink_build_sql_delete can be useful in doing selective replication of
17 a local table to a remote database. It builds an SQL DELETE command
18 that will delete the row with the given primary key values.
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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.
26 primary_key_attnums
28 Attribute numbers (1-based) of the primary key fields, for example
29 1 2.
30 num_primary_key_atts
32 The number of primary key fields.
33 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.
37
39 Returns the requested SQL statement as text.
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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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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)
55PostgreSQL 15.4 2023 DBLINK_BUILD_SQL_DELETE(3)