Since only one row is expected in the result set from this SELECT statement, the table scan here is considered an expensive operation.

因为该select语句的结果集中只期望一行，所以表扫描在这里被认为是代价较高的操作。

youdao

Among the three LocalVariables in the operation model, we are particularly concerned with the one called result, since it will hold the value to be returned after the last statement of the operation.

在操作模型的3个LocalVariable中，我们主要关注称为result的LocalVariable，因为它将会保存执行完操作的最后一条语句之后返回的值。

youdao

The RPG Select statement controls which sub-procedure will be executed based on the RPG operation.

RPG select语句控制基于RPG操作将执行哪些子过程。

youdao

In a brief statement from the White House, Mr.Obama stressed this will be a complex and challenging operation.

VOA: standard.2010.01.13

"And that has been confirmed by people on the ground." Foreign Office Minister Lord Malloch Brown quickly retracted his statement, saying he agreed with the prime minister that the number of helicopters was sufficient for the current operation.

VOA: standard.2009.07.22

"They will also review the progress made in strengthening our economic ties and in enhancing and modernising bilateral security co-operation, " the statement added.

BBC: Obama to meet South Korea's Park Geun-hye in May

"We continue to request that Madiba and his family be accorded the necessary space and privacy and thank the media and the public for co-operation, " the statement from the presidency said.

BBC: Nelson Mandela 'making progress' in hospital

Freeport, which is handling the rescue operation, said in a statement on Tuesday that "the rescue process is difficult and will take some time to complete".

BBC: Freeport's Grasberg copper mine