1. Query Methods
Simple SQL Statements
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2. All – most - some ... ALL : Define the term SQL
MOST : Describe the syntax for SQL statements
SOME : Explain how to use SQL statements on a database
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3. Click to explore more about the SQL Statements …
What is a Database?
SQL Statements?
Thought board
What is SQL?
Select Statements

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 * FROM Customers;
What do you think this SQL statement will do?
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12. Simple SQL Statements …
Think about this SQL Statement … SELECT * FROM Customers; This is known as a Select Statement It will select all the data from the Customers table
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13. Simple SQL Statements …
SELECT * FROM Customers;
Notice that …
SELECT and FROM are in capitals
The asterisk (*) means everything
The semi-colon (;) marks the end of the SQL statement
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14. Select Statements …
The SELECT statement is used to select data from a table The result is stored in a result table, called the Result-Set
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15. Select Statements …
SELECT column_name,column_name FROM table_name; SELECT * FROM table_name;
What do you think these two SQL statements will do?
Will they select the same data?
Northwind – create a select statement to …..
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16. Select Statements …
To select data from the Customers table in a database, you could use this statement … SELECT CustomerName,City FROM Customers;
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17. Select Statements …
SELECT CustomerName,City FROM Customers; This statement will select the CustmerName and City fields from the Customers table
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18. What do you think this SQL statements will do?
Select Statements …
Rather than specifying what fields are to be selected, you can add the astrick (*) SELECT * FROM Customers;
What do you think this SQL statements will do?
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19. Select Statements …
SELECT * FROM Customers; This statement selects everything from the Customers table
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20. Thought Board … SELECT * FROM Customers;
SELECT CustomerName,City FROM Customers;
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