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In table T, set the value of column C1 to 9 and the value of C3 to 4 for all rows for which the value of column C2 is "a". UPDATE T SET C1 = 9 , C3 = 4 WHERE C2 = 'a' Increase value of column C1 by 1 if the value in column C2 is "a".
That is to say, when one or more values are missing for a case, most statistical packages default to discarding any case that has a missing value, which may introduce bias or affect the representativeness of the results. Imputation preserves all cases by replacing missing data with an estimated value based on other available information.
Pip's command-line interface allows the install of Python software packages by issuing a command: pip install some-package-name. Users can also remove the package by issuing a command: pip uninstall some-package-name. pip has a feature to manage full lists of packages and corresponding version numbers, possible through a "requirements" file. [14]
In computing, replace is a command that is used to replace one or more existing computer files or add new files to a target directory. Files with a hidden or system attribute set cannot be replaced using replace. The command lists all files that are replaced. [1]
The mechanical medium utilizes one of the oldest methods of computing and has largely become obsolete. The earliest known method of memory storage and subsequent computerized reading is the Antikythera mechanism (c. 100–150 BCE) which utilizes over thirty gears that spin a dial indicator.