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This redirect category (rcat) template is used to tag any redirect page in any namespace that results when a page is merged into another page. Template parameters Parameter Description Type Status Page content was merged into 1 Title of page into which this former content page was merged, if different from the redirect target page. Page name optional See also {{ R comics from merge }} {{ R ...
{{R to anchor}} If the merged page had the same or very similar content as the target page, then also apply: {{R from duplicated article}} to the redirect that was left behind after the merge. Any comics redirect that has a substantive page history that was not the result of a page merge may be tagged with the {{R with history}} rcat instead.
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 ...
This redirect category (rcat) template is used to tag any redirect page in any namespace that results when a page is merged into another page. Template parameters [Edit template data] Parameter Description Type Status Page content was merged into 1 Title of page into which this former content page was merged, if different from the redirect target page. Page name optional See also {{ R comics ...
The natural join can be simulated with Codd's primitives as follows. Let c 1, ..., c m be the attribute names common to R and S, r 1, ..., r n be the attribute names unique to R and let s 1, ..., s k be the attributes unique to S. Furthermore, assume that the attribute names x 1, ..., x m are neither in R nor in S.
[4]: 114 A DataFrame is a 2-dimensional data structure of rows and columns, similar to a spreadsheet, and analogous to a Python dictionary mapping column names (keys) to Series (values), with each Series sharing an index. [4]: 115 DataFrames can be concatenated together or "merged" on columns or indices in a manner similar to joins in SQL.
Additionally there is a single-row version, UPDATE OR INSERT INTO tablename (columns) VALUES (values) [MATCHING (columns)], but the latter does not give you the option to take different actions on insert versus update (e.g. setting a new sequence value only for new rows, not for existing ones.)
Array, a sequence of elements of the same type stored contiguously in memory; Record (also called a structure or struct), a collection of fields . Product type (also called a tuple), a record in which the fields are not named