sql - Having issues using a Right Join in MS Access 2010 with two tables that have the same fields -

-

i have 2 tables, table , table b. each table have 4 fields, name of fields same both. both tables extracted other tables, , each record acts primary key.

i want write query in ms access 2010 gets data unique table b , not shared table a. using following image reference, , looks need right join.

enter image description here

hello. there not right sql, i've tested , getting incorrect result. below closest i've gotten:

select distinct tableb.* tableb right join tablea on (tableb.field1 = tablea.field1) , (tableb.field2 = tablea.field2) , (tableb.field3 = tablea.field3) , (tableb.field4 = tablea.field4) (((tablea.field1) null));

i think clearer use not exists:

select tableb.* tableb not exists (select 1                   tablea                   (tableb.field1 = tablea.field1) , (tableb.field2 = tablea.field2) , (tableb.field3 = tablea.field3) , (tableb.field4 = tablea.field4)                  );

your use of right join incorrect. phrased, want left join. is, want keep rows in first table (the "left" table in join) regardless of whether or not match exists in second table. however, not exists same thing , logic bit clearer.


Comments

Post a Comment

Popular posts from this blog

How to show in django cms breadcrumbs full path? -

-
need advice - how show in breadcrumbs whole path article or page? i've got code: {% ance in ancestors %} <li> {% if not forloop.last %} <a href="{{ ance.get_absolute_url }}">{{ ance.get_menu_title }}</a> {% else %} <span class="active">{{ ance.get_menu_title }}</span> {% endif %} </li> {% endfor %} but shows "home" , current page. how modify show whole path in breadcrumbs? i've found in file menu_tags.py code calls ancestors. @ least there class showbreadcrumbs: class showbreadcrumb(inclusiontag): """ shows breadcrumb node has same url current request - start level: after level should breadcrumb start? 0=home - template: template used render breadcrumb """ name = 'show_breadcrumb' template = 'menu/dummy.html' options = options( argument('start_level', default=0, require...
Read more

ruby on rails - npm error: tunneling socket could not be established, cause=connect ETIMEDOUT -

-
i have app uses rails framework , implements angularjs part of front end. i have pushed heroku , have heroku toolbelt installed, when try migrate db using "heroku run rake db:migrate" receive following error(s): installing core plugins heroku-cli-addons, heroku-apps, heroku-fork, heroku-git, heroku-local, heroku-run, heroku-status... error installing package. try running again gode_debug=info see more output. ! `run` not heroku command. ! perhaps meant `-h`, `2fa`, `auth`, `join`, `open`, `orgs`, `pg`, `ps` or `rake`. ! see `heroku help` list of available commands. i run command "gode_debug=info heroku run rake db:migrate" , receive error: npm err! darwin 14.5.0 npm err! argv "/users/christopher_pelnar/.heroku/node-v4.2.1-darwin-x64/bin/node" "/users/christopher_pelnar/.heroku/node-v4.2.1-darwin-x64/lib/node_modules/npm/cli.js" "install" "heroku-cli-addons" "heroku-apps" "heroku-fork...
Read more

php - Invalid Cofiguration - yii\base\InvalidConfigException - Yii2 -

-
Image
i've installed yii2-user module/dektrium yii2-app-basic application command composer require "dektrium/yii2-user:0.9.*@dev" config/console.php return [ . . 'modules' => [ 'gii' => 'yii\gii\module', 'user' => [ 'class' => 'dektrium\user\module', ], ], . . ] config/web.php 'components' => [ . . /* 'user' => [ 'identityclass' => 'app\models\user', 'enableautologin' => true, ], */ 'modules' => [ 'user' => [ 'class' => 'dektrium\user\module', ], ], . . ] after that, run command $ php yii migrate/up --migrationpath=@vendor/dektrium/yii2-user/migrations updating database schema . but, when run http://localhost/mylawsuit/yii/web/index.php?r=u...
Read more