The format makes it possible to develop and edit complex multi-sheet spreadsheets with various formulas and data sources. The archive contains a file for describing the table and individual files for each of its worksheets. XLSX files are formatted based on the Open XML standard, which will enable you to compress data by the type of ZIP. The extension allows the use of images, diagrams, and graphic information. Cells contain data, both manually entered, and information that was obtained as a result of calculations. Each table is divided into cells with a unique address, consisting of numeric and alphabetic characters. Thus the data have the form of tables consisting of columns and lines. □ XLSX – is an e-book created with one of the versions of the Excel program older than 2007. The use of different delimiters allows the availability of unequal encoding. In this case, the text strings are clearly organized, so all values are separated by commas or double quotes (if there are reserved symbols). □ On personal computers, the CSV extension includes many values represented as ASCII tables. They can be opened by most editors able to work with tables and texts, including both authentic Excel and open source utilities like Apache Open Office and Libre Office. CSV, in some cases, are сalled flat files. This allows you to transfer information between different programs freely. If there are reserved symbols (for example, a semicolon or a new line), double quotes play the separator role. Commas separate the parameters of each column. Using the spreadsheet application, CSV files can be organized into cells and added to the appropriate database. Each line of the file acts as one row of the database. The data inside of which are separated by commas-developed in the early 70-ies of the XX century to import various table information and transfer bulk information between databases in text format.
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