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Data cleaning: Difference between revisions
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→check if field value was not fulfilled: NULL, empty value
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#* MySQL solution: {{kbd | key = SELECT * FROM table_name WHERE column_name IS NULL;}} | #* MySQL solution: {{kbd | key = SELECT * FROM table_name WHERE column_name IS NULL;}} | ||
#* EXCEL: {{kbd | key =<nowiki>=EXACT(A2, "NULL")</nowiki>}} | #* EXCEL: {{kbd | key =<nowiki>=EXACT(A2, "NULL")</nowiki>}} | ||
# find records with empty value: | # find records with empty value: (not contains {{kbd | key = NULL}} value) | ||
#* MySQL: {{kbd | key = SELECT * FROM table_name WHERE LENGTH(TRIM( column_name )) = 0;}} {{Exclaim}} SQL query with the condition {{kbd | key =SELECT * FROM table_name WHERE column_name IS NOT NULL}} includes empty value | #* MySQL: {{kbd | key = SELECT * FROM table_name WHERE LENGTH(TRIM( column_name )) = 0;}} {{Exclaim}} SQL query with the condition {{kbd | key =SELECT * FROM table_name WHERE column_name IS NOT NULL}} includes empty value | ||
# find records without NULL or empty value: | # find records without NULL or empty value: | ||