Database - Introduction to SQL
Exercise : Introduction to SQL - True or False
- Introduction to SQL - General Questions
- Introduction to SQL - True or False
16.
DISTINCT and its counterpart, ALL, can be used more than once in a SELECT statement.
17.
The result of every SQL query is a table.
18.
COUNT(field_name) tallies only those rows that contain a value; it ignores all null values.
19.
SUM, AVG, MIN, and MAX can only be used with numeric columns.
20.
Most companies keep at least two versions of any database they are using.
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