In this presentation, we covered WHERE conditions and Operators in SQL.

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SQL
Where Clause

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Where Clause
1. Where
2. AND
3. OR
4. Like

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Where Clause
Where Clause is used to extract only those records that
satisfied the given condition, like fetch only those student record
which has more than 75 marks

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When use where clause ?
1. To retrieve the only specific record
2. To delete the only specific record
3. To update only specific record

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Operators in The WHERE Clause
1. =
2. <>
3. >
4. <
5. >=
6. <=
7. BETWEEN
8. LIKE
9. IN
10.NOT

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Syntax
SELECT column_name,column_name FROM table_name
WHERE column_name operator value;
Ex: SELECT * from student WHERE marks>75;

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And Clause
And clause is used to combine two or more than two
conditions together. In this case, you need must be true both
condition then return the result otherwise it won’t return any
result.
Suppose you want to get only students records who have
more than 75 marks and CSE branch in that case you can
combine these two conditions by using AND clause.

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Syntax
SELECT columns FROM table_name
WHERE condition 1 AND condition 2;
Ex: SELECT * from student
WHERE marks>75 AND branch=‘cse’;

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OR Clause
OR clause is used to combine two or more than two
conditions together, In this case, you need at least one condition
must true then only it will return the result.
Suppose you want to get only those students records who
have more than 75 marks or CSE branch in that case you can be
combine these two conditions by using OR clause.

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Syntax
SELECT columns FROM table_name
WHERE condition 1 OR condition 2;
Ex: SELECT * from student
WHERE marks>75 OR branch=‘cse’;

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Not Operator
The NOT operator retrieves a records if the condition(s) is
NOT TRUE

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Syntax
SELECT column1, column2, ...
FROM table_name
WHERE NOT condition;
Ex: SELECT * FROM student
WHERE NOT Country=‘usa';

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Like Operator
Like Operator is used in a WHERE clause to search for a
specified pattern in a column.
Suppose you want to search those students records whose
names starts with M alphabet.

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Syntax
SELECT column_name FROM table_name
WHERE column_name LIKE pattern;
Ex: SELECT * FROM student
WHERE student_name LIKE ‘m%';

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LIKE operators with '%' and '_‘Wildcard Characters
LIKE Operator Description
WHERE student_name LIKE ‘ra%' Finds any values that starts with “ra"
WHERE student_name LIKE '%ra' Finds any values that ends with “ra"
WHERE student_name LIKE '%sr%' Finds any values that have “sr" in any position
WHERE student_name LIKE '_m%' Finds any values that have “m" in the second
position
WHERE student_name LIKE ‘e_%_%' Finds any values that starts with “e" and are at
least 3 characters in length
WHERE student_name LIKE ‘s%d' Finds any values that starts with “s" and ends with
“d"

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Between Operator
1. BETWEEN returns values that fall within a given range.
2. BETWEEN is a shorthand for >= AND <=.
3. BETWEEN operator is inclusive: begin and end values are
included.

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Syntax
SELECT column-names
FROM table-name
WHERE column-name BETWEEN value1 AND value2;
Ex: SELECT * FROM student
WHERE marks BETWEEN 60 AND 75;

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IN operator
The IN operator allows you to specify multiple values in a
WHERE clause.
The IN operator is a shorthand for multiple OR conditions

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Syntax
SELECT column_name(s)
FROM table_name
WHERE column_name IN (value1, value2, ...);
Or
SELECT column_name(s)
FROM table_name
WHERE column_name IN (SELECT STATEMENT);

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IN operator Examples
SELECT * FROM student
WHERE Country IN (‘india', ‘usa', ‘china');
Or
SELECT * FROM student
WHERE Country IN (SELECT Country FROM employee);

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