Postgresql 使用'；比如'；在INSERT语句中描述来自dblink的记录'；ed SELECT语句

我试图简化以下最后陈述：

DROP TABLE asdf;

CREATE TABLE asdf (LIKE calibrations);

INSERT INTO asdf (rid, pid, status, cal_date, project_name, username,
  sensor_type, serial_number, var_name, dsm_name, cal_type, channel,
  gainbplr, ads_file_name, set_times, set_points, averages, stddevs, cal,
  temperature, comment)
  SELECT * FROM dblink(
    'host=remoteserv user=auser password=hello dbname=cals',
    'SELECT * FROM calibrations WHERE username=\'JAM\'') AS
      t(rid character varying(20), pid character varying(20),
        status character(3), cal_date timestamp,
        project_name character varying(32), username character varying(32),
        sensor_type character varying(20), sn character varying(20),
        var_name character varying(20), dsm_name character varying(16),
        cal_type character varying(16), channel character(1),
        gainbplr character(2), ads_file_name character varying(40),
        set_times timestamp[], set_points double precision[],
        averages double precision[], stddevs double precision[],
        cal double precision[], temperature double precision,
        comment character varying(256));

我能够将最后一句话简化为：

INSERT INTO asdf 
  SELECT * FROM dblink(
    'host=remoteserv user=auser password=hello dbname=cals',
    'SELECT * FROM calibrations WHERE username=\'JAM\'') AS
      t(rid character varying(20), pid character varying(20),
        status character(3), cal_date timestamp,
        project_name character varying(32), username character varying(32),
        sensor_type character varying(20), sn character varying(20),
        var_name character varying(20), dsm_name character varying(16),
        cal_type character varying(16), channel character(1),
        gainbplr character(2), ads_file_name character varying(40),
        set_times timestamp[], set_points double precision[],
        averages double precision[], stddevs double precision[],
        cal double precision[], temperature double precision,
        comment character varying(256));

最后一句话可以这样写吗

INSERT INTO asdf 
  SELECT * FROM dblink(
    'host=remoteserv user=auser password=hello dbname=cals',
    'SELECT * FROM calibrations WHERE username=\'JAM\'') AS
      t(LIKE calibrations);

--John

否，dblink（）函数返回

setof record

，数据库需要知道列列表。dblink文档中提到了这一点：

函数返回查询生成的行。因为dblink可以与 任何查询，都声明为返回记录，而不是指定任何特定的 一组列。这意味着您必须在 调用查询-否则PostgreSQL将不知道会发生什么

SELECT

语句的

FROM

子句具有以下定义：

where from_item can be one of:

    [ ONLY ] table_name [ * ] [ [ AS ] alias [ ( column_alias [, ...] ) ] ]
    ( select ) [ AS ] alias [ ( column_alias [, ...] ) ]
    with_query_name [ [ AS ] alias [ ( column_alias [, ...] ) ] ]
    function_name ( [ argument [, ...] ] ) [ AS ] alias [ ( column_alias [, ...] | column_definition [, ...] ) ]
    function_name ( [ argument [, ...] ] ) AS ( column_definition [, ...] )
    from_item [ NATURAL ] join_type from_item [ ON join_condition | USING ( join_column [, ...] ) ]