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Questions and Answers
What is the primary purpose of the SQL WHERE clause?
What is the primary purpose of the SQL WHERE clause?
- To delete unwanted records from a database
- To filter records based on a specified condition (correct)
- To sort records in a specific order
- To insert new records into a database
What is the correct way to enclose a text value in a SQL query?
What is the correct way to enclose a text value in a SQL query?
- Without any quotes
- With single quotes (correct)
- With parentheses
- With double quotes
Which of the following operators can be used in the SQL WHERE clause?
Which of the following operators can be used in the SQL WHERE clause?
- Only the > operator
- Other operators besides the = operator (correct)
- No operators can be used in the WHERE clause
- Only the = operator
What should be done when working with numeric fields in a SQL query?
What should be done when working with numeric fields in a SQL query?
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What is the purpose of the syntax section in a SQL tutorial?
What is the purpose of the syntax section in a SQL tutorial?
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Study Notes
SQL WHERE Clause
- The WHERE clause is used to filter records, extracting only those that fulfill a specified condition.
- It is used to specify the condition for which records to include in the result set.
Syntax
- The syntax for the WHERE clause depends on the database system being used.
Demo Database
- The Customers table is used in the examples, with a selection of fields shown.
Text Fields vs. Numeric Fields
- SQL requires single quotes around text values, although most database systems also allow double quotes.
- Numeric fields should not be enclosed in quotes, unlike text values.
Operators in The WHERE Clause
- The = operator is not the only operator that can be used in the WHERE clause.
- Other operators can be used to filter the search, including: (Note: The other operators are not specified in the provided text, but will be included in a comprehensive study of the WHERE clause.)
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