SQL SERVER 2012 Chapter fourth connecting Joinのinner join

Source: Internet
Author: User

The common denominator of all join statements is that a record is matched to another record or records, resulting in a new record, which is a superset of the combined columns of two records.

Internal connection:

Internal connection syntax structure: SELECT <select list> from <first table> <join_type> <second table> [on <join_ Condition>]

INNER JOIN (inner join) similar to the WHERE clause

An internal connection is an exclusive connection that excludes all records in the table that do not match.

Inner keywords generally do not write. The default join is inner join.

SQL SERVER 2012 Chapter fourth connecting Joinのinner join

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