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Oracle and IBM Db2 provide a construct explicitly named CLOB, [1] [2] and the majority of other database systems support some form of the concept, often labeled as text, memo or long character fields. CLOBs usually have very high size-limits, of the order of gigabytes. The tradeoff for the capacity is usually limited access methods.
Data cleansing may also involve harmonization (or normalization) of data, which is the process of bringing together data of "varying file formats, naming conventions, and columns", [2] and transforming it into one cohesive data set; a simple example is the expansion of abbreviations ("st, rd, etc." to "street, road, etcetera").
SELECT list is the list of columns or SQL expressions to be returned by the query. This is approximately the relational algebra projection operation. AS optionally provides an alias for each column or expression in the SELECT list. This is the relational algebra rename operation. FROM specifies from which table to get the data. [3]
The result of Wagner's objective evaluation of the SQL/XML:2006 standard compliance of Oracle 11g Release 1, MS SQL Server 2008 and MySQL 5.1.30 is shown in the following table [2], to which the data for PostgreSQL 9.1, [5] [6] and IBM DB2 has been added:
New IDE, No PL/SQL, User Exits, INP ASCII File, FRM Runtime File SQL*Forms 2.3 5 Character Runtime improvements SQL*Forms 3 6 Character Major Rewrite, Improved IDE, PL/SQL included, X Support, Generate code to enforce constraints Oracle Forms 4.0 6-7 GUI / Character Major Rewrite, New IDE, FMB source binary file, FMX Runtime, optimized for ...
SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...
Atlanta (/ æ t ˈ l æ n t ə / ⓘ at-LAN-tə) [14] is the capital and most populous city in the U.S. state of Georgia.It is the seat of Fulton County, and a portion of the city extends into neighboring DeKalb County.
white, abbreviated w, was the first sex-linked mutation discovered, found in the fruit fly Drosophila melanogaster.In 1910 Thomas Hunt Morgan and Lilian Vaughan Morgan collected a single male white-eyed mutant from a population of Drosophila melanogaster fruit flies, which usually have dark brick red compound eyes.