Delete Marked 删除选中的行和列 Conditional Delete（条件删除） 打开Specify Row Condition（指定行条件）对话框，可以设置指定的删除条件标 准。
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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。
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.
条件中指定的变量必须在设置了断点的行中，否则表达式就没有什么意义！
The variables specified in the condition must be in scope at whatever line you set the breakpoint on, otherwise the expression wouldn't make sense!
or节点告诉我们，它将匹配满足它的子节点所指定的一个或多个条件的任何行。
The or node tells us that we'll match any rows that satisfy one or more of the criteria specified by its child nodes.
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