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There is a column HOBBY in a table CONTACTS. The following two 1 statements are giving different outputs. What may be the possible reason? SELECT COUNT(*) FROM CONTACTS; SELECT COUNT(HOBBY) FROM CONTACTS;

Posted by Dhruv Dahiya 4 years, 1 month ago

CBSE > Class 12 > Informatics Practices

1 answers

Kartick Chauhaan 3 years, 11 months ago

SELECT COUNT(*) FROM CONTACTS; ☝️ This statement gives one type of output. This is because the function Count(*) counts total number of records in the table. It also includes the NaN values as records. BUT THE STATEMENT SELECT COUNT(HOBBY) FROM CONTACTS; Gives another output. This is because this statement is applied over a column and so it does not includes the NaN values.

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