There's potentially much less I/O to execute the query, if the index is narrow enough when compared to the rows and columns in the table itself, meaning it's a real subset of the total columns. Consider covering indexes when selecting a small portion of a large table, and where that...
The database commonly uses an index range scan to access selective data.Theselectivityis the percentage of rows in the table that the query selects, with 0 meaning no rows and 1 meaning all rows. Selectivity is tied to a querypredicate, such asWHERE last_name LIKE 'A%', or a combinatio...
Maximum Number of Index per Table & Max No Of Columns in Non-Cluster Index in SQL Server 2005/2008/2012? Maximum Parameters in Where Clause Maximum Row should return in Join condition Right,Left and Inner Meaning of "Grant Alter to <User>" ? Merge error handling MERGE for Remote Table ...
CAPABILITY_HIERARCHICAL_TRANSPORTABLE - Static variable in interface com.sap.portal.pcm.admin.ICatalogNode A constant that represents an object with hierarchical transportability, meaning it can be transported with all its sons. CAPABILITY_INTERACTION - Static variable in interface com.sap.portal.sl....
INSERTINTOdictionary(name,meaning)VALUES('antonym','a word that means the opposite of another word'),('connotation','an additional idea or emotion that a word suggests to you, in addition to its literal or main meaning'),('etymology','he study of the origins of words; the origins of a...
They have the same meaning as for the ALTER TABLE statement. For more information, see Section 15.1.9, “ALTER TABLE Statement” NDB Cluster supports online operations using the same ALGORITHM=INPLACE syntax used with the standard MySQL Server. See Section 25.6.12, “Online Operations with ...
So adding it to a query, as described in this article, might change the meaning of the query and not just the plan. Iow, take care! Using STRAIGHT_JOIN might change your query from an implicit LEFT JOIN to an implicit INNER JOIN. https://gist.github.com/tom--/893e62688b69014e09b...
As you can see, the number of logical reads is 31, meaning SQL Server read 31 8KB pages to show the result. We wrote a query to find details of some reputation values on a particular day. SQL Server performed a clustered index seek operation, as you see in the following image: ...
ItemMeaning UNIQUE means that the values in the indexed columns must be unique. index_name the name of the index. table_name a table. column_name the indexed column. tab_space the tablespace for the index. CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL, ENAME VARCHAR2(10), JOB VARCHAR2(...
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