The second major function performed by a WHERE clause is to join multiple tables together into a single table that can be queried more easily.

WHERE 子句执行的第二个主要功能是将多个表连接到单个表中，从而更易于查询。

youdao

If no WHERE clause is included, all rows in the table are deleted.

如果没有包括任何where子句，则删除表中的所有行。

youdao

A more efficient technique is to filter database rows by placing conditions in the WHERE clause, which is evaluated immediately after the tables are specified within the FROM clause.

更有效的方法是通过在where子句中放置条件来过滤数据库行，在from子句中指定表之后会立即对where子句求值。

youdao

The question is where precisely this clause bites.

ECONOMIST: The supreme court wants to rule on the euro rescue

But a student being informed about risks should not be just cause for a complete liability waiver for a university or the NCAA. This type of clause is best designed for adults of relatively equal bargaining power in a business transaction or at least where there is an employer-employee relationship.

FORBES: The Devilish Details Of The NCAA's New Genetic Testing Rules