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Data cleaning: Difference between revisions
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Finds whether a variable is NULL | Finds whether a variable is NULL | ||
* PHP [http://tw2.php.net/is_null is_null] | * PHP [http://tw2.php.net/is_null is_null] | ||
* Google spreadsheet: | * Google spreadsheet / Excel: | ||
** [https://support.google.com/drive/answer/3093348 ISERR(value)] " value - The value to be verified as an error type other than #N/A." ex: {{kbd | key = #NULL!}} | ** [https://support.google.com/drive/answer/3093348 ISERR(value)] " value - The value to be verified as an error type other than #N/A." ex: {{kbd | key = #NULL!}} | ||
** If the cell value is exactly {{kbd | key = NULL}} not {{kbd | key = #NULL!}}, You may use {{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>EXACT(value, "NULL")</nowiki>}} | ||
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Finds whether a variable is NOT NULL | Finds whether a variable is NOT NULL | ||
* MySQL SQL syntax: {{kbd | key = SELECT * FROM table WHERE column IS NOT NULL;}} [http://sqlfiddle.com/#!2/ec1152/2/0 demo] | * MySQL SQL syntax: {{kbd | key = SELECT * FROM table WHERE column IS NOT NULL;}} [http://sqlfiddle.com/#!2/ec1152/2/0 demo] | ||
== check if field value was not fulfilled: NULL, empty value == | == check if field value was not fulfilled: NULL, empty value == | ||