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copied!<p>somehting=>something</p> <pre> postgres=# create database test postgres-# ; CREATE DATABASE postgres=# \c test You are now connected to database "test". test=# select version(); version ----------------------------------------------------------------------------------------------- PostgreSQL 8.3.3 on i486-pc-linux-gnu, compiled by GCC cc (GCC) 4.2.3 (Ubuntu 4.2.3-2ubuntu7) test=# create table main(id int); CREATE TABLE test=# create table something_link(mainid int); CREATE TABLE test=# create table something(id int); CREATE TABLE test=# create table type(id int); CREATE TABLE test=# alter table something add column typeid int; ALTER TABLE test=# SELECT * test-# FROM "main" main test-# INNER JOIN "something_link" something_link ON main."id" = something_link."mainid" test-# INNER JOIN "something" somehting ON something_link."somethingid" = something."id" test-# INNER JOIN "type" type ON something."typeid" = type."id" test-# ; ERROR: column something_link.somethingid does not exist LINE 4: INNER JOIN "something" somehting ON something_link."som... ^ test=# alter table something_link add column somethingid int; ALTER TABLE test=# SELECT * FROM "main" main INNER JOIN "something_link" something_link ON main."id" = something_link."mainid" INNER JOIN "something" *somehting* ON something_link."somethingid" = something."id" INNER JOIN "type" type ON something."typeid" = type."id" ; ERROR: invalid reference to FROM-clause entry for table "something" LINE 4: ...hing" somehting ON something_link."somethingid" = something.... ^ HINT: Perhaps you meant to reference the table alias "somehting". test=# SELECT * FROM "main" main INNER JOIN "something_link" something_link ON main."id" = something_link."mainid" INNER JOIN "something" something ON something_link."somethingid" = something."id" INNER JOIN "type" type ON something."typeid" = type."id" ; id | mainid | somethingid | id | typeid | id ----+--------+-------------+----+--------+---- (0 rows) </pre>

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