如果没有指定value子句，则表示没有定义该项的初始值。
If a value clause is not specified, the initial value of the item is undefined.
如果在sql语句的select子句的XMLQUERY函数中使用xml谓词，则这些谓词不会从结果集中排除任何行，因此不能使用索引。
If you use XML predicates in the XMLQUERY function in the select clause of an SQL statement, these predicates do not eliminate any rows from the result set and therefore cannot use an index.
但是异常参数t被声明为Throwable，且如果没有修改throws子句，则Throwable不能从foo中抛出。
But the exception parameter t is declared as a Throwable, and Throwable cannot be thrown from foo unless the throws clause is modified.
如果没有包括任何where子句，则删除表中的所有行。
If no WHERE clause is included, all rows in the table are deleted.
如果数据提供程序是一个SQL数据库，则必须将where子句应用于每条记录。
If the data provider is an SQL database, the WHERE clause must be applied to each record.
将每个图形模式变量的绑定与模型节点进行匹配就成为一种查询解决方案，而select子句中指定的变量值则成为查询结果的一部分。
Each matching binding of the graph pattern's variables to the model's nodes becomes a query solution, and the values of the variables named in the SELECT clause become part of the query results.
如果没有包括where子句，则update语句将修改表中所有行的指定列。
If the WHERE clause isn't included, the UPDATE statement modifies the indicated columns for all rows in the table.
“分组依据”列(因为尚未指定聚合查询)，则搜索条件将被放入where子句中。
Group By column of the grid is not displayed (because you have not yet specified an aggregate query), the search condition is placed into the WHERE clause.
因此，如果将列添加到查询输出中，则查询和视图设计器会自动将其添加到“SQL”窗格中语句的GROUPby子句中。
Therefore, if you add columns to the query output, the query and View Designer automatically adds them to the GROUP BY clause of the statement in the SQL pane.
但是，如果链接的OR子句优先级高于AND子句，则每个OR子句都会重复AND子句。
However, if the linked or clauses take precedence over an AND clause, the AND clause is repeated for each or clause.
在查询运算式中，若要将子运算式的结果用于后续子句，则储存子运算式的结果有时会十分有用。
In a query expression, it is sometimes useful to store the result of a sub-expression in order to use it in subsequent clauses.
在查询运算式中，若要将子运算式的结果用于后续子句，则储存子运算式的结果有时会十分有用。
In a query expression, it is sometimes useful to store the result of a sub-expression in order to use it in subsequent clauses.
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