dblink_build_sql_delete(text relname,
int2vector primary_key_attnums,
integer num_primary_key_atts,
text[] tgt_pk_att_vals_array) returns textdblink_build_sql_delete can be
useful in doing selective replication of a local table to a remote
database. It builds a SQL DELETE command
that will delete the row with the given primary key values.
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.
Attribute numbers (1-based) of the primary key fields, for example 1 2.
The number of primary key fields.
Values of the primary key fields to be used in the resulting DELETE command. Each field is represented in text form.
As of PostgreSQL 9.0, the attribute numbers in primary_key_attnums are interpreted as logical column numbers, corresponding to the column's 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.