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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?
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?
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?
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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Description
Learn about the SQL WHERE clause, its syntax, and how it's used to filter records based on specific conditions.
