Small Tricky SQL Queries Help

1) What is the output of "SELECT 15"

OUTPUT : 15

2) What is the output of “SELECT $”

OUTPUT : 0

3) What is the output of “SELECT COUNT(*)$"

OUTPUT : 1

4) What is the output of “SELECT COUNT('5') $"

OUTPUT : 1

5) What is the output of “SELECT 'ANNE'"

OUTPUT : ANNE

6) What is the output of “SELECT 'ANNE' + '1'"

OUTPUT : ANNE1

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