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Join method: Given two tables and a join condition, multiple algorithms can produce the result set of the join. Which algorithm runs most efficiently depends on the sizes of the input tables, the number of rows from each table that match the join condition, and the operations required by the rest of the query.
An associative (or junction) table maps two or more tables together by referencing the primary keys (PK) of each data table. In effect, it contains a number of foreign keys (FK), each in a many-to-one relationship from the junction table to the individual data tables. The PK of the associative table is typically composed of the FK columns ...
The sort-merge join (also known as merge join) is a join algorithm and is used in the implementation of a relational database management system. The basic problem of a join algorithm is to find, for each distinct value of the join attribute, the set of tuples in each relation which display that value. The key idea of the sort-merge algorithm is ...
Within computing, author O'Connell defines join selection factor as "[t]he percentage (or fraction) of records in one file that will be joined with records of another file". [1] This can be calculated when two database tables are to be joined. It is primarily concerned with query optimization.
The right outer join ( ) behaves almost identically to the left outer join, but the roles of the tables are switched. The right outer join of relations R and S is written as R S. [e] The result of the right outer join is the set of all combinations of tuples in R and S that are equal on their common attribute names, in addition to tuples in S ...
For reference, experts recommend no more than one drink a day for females and no more than two drinks a day for males. One drink is defined as 1.5 ounces of liquor, 12 ounces of beer or 5 ounces ...
As wildfires continue to rage through the Los Angeles area, the NFL has already put together an alternate plan for the Vikings-Rams playoff game.
The U.S. Marshals Service in the District of Nevada issued a plea for help and additional reward money to find a man wanted for killing his girlfriend during an argument a year and a half ago in ...