1. Query Methods
Where Clauses
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2. All – most - some ... ALL : Define the term SQL
MOST : Describe the syntax for using WHERE clauses
SOME : Explain how to use operators with WHERE clauses
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3. Click to explore more about the WHERE clauses …
What is a Database?
SQL Statements
AND & OR
Thought board
What is SQL?
WHERE Clauses

4. What is a Database ..?
A database is just a collection of data A simple database could be a computing text book
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5. What is a Database ..?
Data about each topic is stored in the book The data is organised into chapters You can search for a topic using the content and index pages
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6. What is a Database ..?
Organisations have data that they need to store, collate and analyse 30 years ago this data would have been stored in a filing cabinet
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7. What is a Database ..?
Modern organisations use computer systems to store, collate and analyse data These systems are called Databases
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8. What is SQL ..?
SQL (Structured Query Language) is used to search through and manage databases SQL is written as statements that are executed by the database
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9. What is SQL ..?
SQL statements can be used to perform the following tasks …
Execute queries against a database
Retrieve data from a database
Insert records in a database
Update records in a database
Delete records from a database
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10. Simple SQL Statements …
We use SQL Statements to manage large databases SQL statements can be used to Select Data, Update Data and Delete Data
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11. Simple SQL Statements …
Think about this SQL Statement … SELECT column_name,column_name FROM table_name;
What do you think this SQL statement will do?
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12. Where Clauses …
The WHERE clause is used to filter records in a Query It extracts (or selects) only those records that fulfil a specified criteria
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13. Can you think what this SQL statement might look like?
Where Clauses …
You could use a WHERE clause to search for everyone who lives in Leicester
Can you think what this SQL statement might look like?
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14. Where Clauses …
The syntax for a WHERE clause is … SELECT column_name,column_name FROM table_name WHERE column_name operator value;
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15. What do you think is the purpose of this SQL statement?
Where Clauses …
Think about this SQL statement … SELECT * FROM Customers WHERE Country=‘Scotland';
What do you think is the purpose of this SQL statement?
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16. Where Clauses …
SELECT * FROM Customers WHERE Country=‘Scotland'; This SQL statement selects all the customers from the country “Scotland", in the Customers table
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17. AND & OR …
The AND & OR operators are used to filter records based on more than one WHERE condition
For example …
Male AND Brown Hair
Male OR Brown Hair
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18. AND & OR …
The AND operator displays a record if both the first condition AND the second condition are true The OR operator displays a record if either the first condition OR the second condition is true
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19. What do you think this SQL statement does?
AND & OR …
Think about this SQL statement … SELECT * FROM Customers WHERE Country=‘UK' AND City=‘Birmingham';
What do you think this SQL statement does?
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20. AND & OR …
Think about this SQL statement … SELECT * FROM Customers WHERE Country=‘UK' AND City=‘Birmingham'; This statement selects all customers from the country “UK" AND the city “Birmingham", in the Customers table
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21. What do you think this SQL statement does?
AND & OR …
Think about this SQL statement … SELECT * FROM Customers WHERE City=‘Birmingham' OR City=‘Glasgow';
What do you think this SQL statement does?
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22. AND & OR …
Think about this SQL statement … SELECT * FROM Customers WHERE City=‘Birmingham' OR City=‘Glasgow'; This SQL statement elects all customers from the city “Birmingham" OR “Glasgow", in the Customers table
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23. AND & OR …
You can combine AND and OR within one SQL statement Think about this SQL statement … SELECT * FROM Customers WHERE Country=‘Scotland' AND (City=‘Glasgow' OR City=‘Aberdeen');
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24. AND & OR …
Think about this SQL statement … SELECT * FROM Customers WHERE Country=‘Scotland' AND (City=‘Glasgow' OR City=‘Aberdeen'); This SQL statement selects all customers from the country “Scotland" AND the city must be equal to “Glasgow" OR “Aberdeen"
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25. Thought Board …
SELECT * FROM Customers WHERE City=‘Birmingham' OR City=‘Glasgow';
SELECT column_name,column_name FROM table_name;
SELECT * FROM Customers WHERE Country=‘Scotland';
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