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Data cleaning: Difference between revisions
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→is null: R
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** If the cell value is exactly {{kbd | key = NULL}} not {{kbd | key = #NULL!}}, You may use {{kbd | key = <nowiki>COUNTIF(value, "NULL")</nowiki>}} or {{kbd | key = <nowiki>EXACT(value, "NULL")</nowiki>}} | ** If the cell value is exactly {{kbd | key = NULL}} not {{kbd | key = #NULL!}}, You may use {{kbd | key = <nowiki>COUNTIF(value, "NULL")</nowiki>}} or {{kbd | key = <nowiki>EXACT(value, "NULL")</nowiki>}} | ||
* MySQL SQL syntax: {{kbd | key = SELECT * FROM table WHERE column IS NULL;}}<ref>[http://dev.mysql.com/doc/refman/5.0/en/working-with-null.html MySQL :: MySQL 5.0 Reference Manual :: 3.3.4.6 Working with NULL Values]</ref> | * MySQL SQL syntax: {{kbd | key = SELECT * FROM table WHERE column IS NULL;}}<ref>[http://dev.mysql.com/doc/refman/5.0/en/working-with-null.html MySQL :: MySQL 5.0 Reference Manual :: 3.3.4.6 Working with NULL Values]</ref> | ||
* R: is.null(): [https://stat.ethz.ch/R-manual/R-devel/library/base/html/NULL.html R: The Null Object] | |||
Find whether a variable is NOT NULL | Find whether a variable is NOT NULL | ||