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				           		索引扫描可以是非匹配的,这意味着在基础索引的扫描上没有限制。
						        					            	 An index scan can be non-matching, which means that there are no restrictions in the scan of the underlying index.
								    										 
								    				            	 youdao 
- 
				           		索引扫描可以是非匹配的,这意味着在基础索引的扫描上没有限制。
						        					            	 An index scan can be non-matching, which means that there are no restrictions in the scan of the underlying index.
								    										 
								    				            	 youdao