外がい部ぶ結けつ合ごう

noun

outer join

In relational databases, a join that returns all rows from one table and matched rows from another, with NULLs where no match exists. Often specified as LEFT, RIGHT, or FULL outer join.

• SQLで外がい部ぶ結けつ合ごうを使つかうと、片かた方ほうのテーブルに一いっ致ちする行ぎょうがなくてもデータを取しゅ得とくできます。

  Using an outer join in SQL, you can retrieve data even when there is no matching row in one of the tables.

noun

external coupling; external linkage

General engineering term for a connection or linkage between separate systems or components. Less common than the database sense; context usually makes the meaning clear.

• この機き械かいは外がい部ぶ結けつ合ごうによって別べつの装そう置ちと連れん動どうします。

  This machine works together with another device through an external coupling.