Concept explainers
a.
SELECT statement:
It is used to retrieve information from the table or
Syntax:
SELECT * FROM table_Name;
CASE statement:
The CASE statement checks through the condition and returns a value when the first condition is satisfied. If none of the conditions is true, it returns the value in the ELSE clause.
Syntax:
CASE
WHEN condition_1 THEN result_1
WHEN condition_2 THEN result_2
WHEN condition_N THEN result_N
ELSE result
END;
b.
GROUP BY Clause:
The GROUP BY clause is used to group the result of a SELECT statement done on a table where the tuple values are similar for more than one column
Syntax:
SELECT expression1, expression2, expression_n, aggregate_function (expression)FROM table_name WHERE conditions GROUP BY expression1, expression2, expression_n;
“COUNT()” function:
In SQL, the “COUNT()” function will return the total number of rows in the table with satisfying the criteria mentioned in the “WHERE” clause.
CASE statement:
The CASE statement checks through the condition and returns a value when the first condition is satisfied. If none of the conditions is true, it returns the value in the ELSE clause.
Syntax:
CASE
WHEN condition_1 THEN result_1
WHEN condition_2 THEN result_2
WHEN condition_N THEN result_N
ELSE result
END;
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