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There is also an IGNORE clause for the INSERT statement, [7] which tells the server to ignore "duplicate key" errors and go on (existing rows will not be inserted or updated, but all new rows will be inserted). SQLite's INSERT OR REPLACE INTO works similarly. It also supports REPLACE INTO as an alias for compatibility with MySQL. [8]
In situations where the number of unique values of a column is far less than the number of rows in the table, column-oriented storage allow significant savings in space through data compression. Columnar storage also allows fast execution of range queries (e.g., show all records where a particular column is between X and Y, or less than X.)
Modern Sort/Merge programs also can copy files, select or omit certain records, summarize records, remove duplicates, reformat records, append new data and produce reports. Indeed, most Sort/Merge applications use the wide range of additional processing capabilities, rather than purely sorting or merging records: the Sort/Merge product is a ...
In computing, a materialized view is a database object that contains the results of a query.For example, it may be a local copy of data located remotely, or may be a subset of the rows and/or columns of a table or join result, or may be a summary using an aggregate function.
It is a rough merging method, but widely applicable since it only requires one common ancestor to reconstruct the changes that are to be merged. Three way merge can be done on raw text (sequence of lines) or on structured trees. [2] The three-way merge looks for sections which are the same in only two of the three files.
A transactional table is the most basic and fundamental. The grain associated with a transactional fact table is usually specified as "one row per line in a transaction", e.g., every line on a receipt. Typically a transactional fact table holds data of the most detailed level, causing it to have a great number of dimensions associated with it.
Salesforce Tower is 61 stories tall, [3] and covers 1,400,000 sq ft (130,000 m 2) of floorspace. [19] The building's top 150 feet (46 m) above the 61st floor have been described as "largely ornamental". [16] The 61st floor is known as the Ohana Floor and serves as an observation deck and lounge for Salesforce employees and guests. [20]
[8] [9] The 1q21.1 area contains 20–40 genes. There are two main ways that the copy number variations of 1q21.1 might appear: Type I, which spans roughly 1.8 Mb and includes only the distal end area of 1q21.1, and type 2, which extends proximally to include the thrombocytopenia absent radius syndrome region, span around 2.7 Mb. [9] [1]