How to use searching and filtering data in an SQL server?

Question

Ravi Vishwakarma · Answer

Searching and filtering data in 
SQL Server is primarily done using the SELECT statement combined with various clauses such as
WHERE, LIKE, IN, BETWEEN, 
AND, OR, ORDER BY, and more. Here are some common ways to search and filter data:
1. Basic Filtering with WHERE
The WHERE clause is used to filter records based on specified conditions.
Example: Filtering by a Single Condition
SELECT * FROM CollegeStudents
WHERE LastName = 'Doe';
2. Using AND and OR for Multiple Conditions
You can combine multiple conditions using AND and OR.
Example: Filtering by Multiple Conditions
SELECT * FROM CollegeStudents
WHERE LastName = 'Doe' AND FirstName = 'John';
SELECT * FROM CollegeStudents
WHERE LastName = 'Doe' OR LastName = 'Smith';
3. Pattern Matching with LIKE
The LIKE operator is used for pattern matching. It often includes wildcard characters such as
% (matches any sequence of characters) and _ (matches any single character).
Example: Using LIKE for Pattern Matching
SELECT * FROM CollegeStudents
WHERE LastName LIKE 'S%';  -- Last names starting with 'S'
SELECT * FROM CollegeStudents
WHERE FirstName LIKE '_a%';  -- First names with 'a' as the second character
4. Filtering with IN
The IN operator allows you to specify multiple values in a 
WHERE clause.
Example: Using IN to Filter by a List of Values
SELECT * FROM CollegeStudents
WHERE LastName IN ('Doe', 'Smith');
5. Filtering with BETWEEN
The BETWEEN operator is used to filter within a range of values. It works with numbers, text, and dates.
Example: Using BETWEEN for Ranges
SELECT * FROM CollegeStudents
WHERE DOB BETWEEN '2000-01-01' AND '2001-12-31';
6. Sorting Results with ORDER BY
The ORDER BY clause is used to sort the result set by one or more columns.
Example: Sorting Results
SELECT * FROM CollegeStudents
ORDER BY LastName ASC;  -- Ascending order
SELECT * FROM CollegeStudents
ORDER BY DOB DESC;  -- Descending order
7. Combining Filtering and Sorting
You can combine filtering and sorting in a single query.
Example: Filtering and Sorting
SELECT * FROM CollegeStudents
WHERE DOB BETWEEN '2000-01-01' AND '2001-12-31'
ORDER BY LastName ASC;
8. Filtering with Aggregate Functions
You can use aggregate functions such as COUNT, SUM, 
AVG, MIN, and MAX in conjunction with the 
GROUP BY and HAVING clauses to filter grouped data.
Example: Using Aggregate Functions
SELECT LastName, COUNT(*) AS NumberOfStudents
FROM CollegeStudents
GROUP BY LastName
HAVING COUNT(*) > 1;
Note
WHERE: Basic filtering.AND and OR: Combining multiple conditions.LIKE: Pattern matching.IN: Filtering by a list of values.BETWEEN: Filtering within a range.ORDER BY: Sorting results.Combining: Use filtering and sorting together for powerful queries.
These techniques allow you to effectively search and filter data in SQL Server, tailoring your queries to meet specific needs and extract meaningful information from your database.
Read more
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How to use searching and filtering data in an SQL server?

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1 Answers

1. Basic Filtering with `WHERE`

2. Using `AND` and `OR` for Multiple Conditions

3. Pattern Matching with `LIKE`

4. Filtering with `IN`

5. Filtering with `BETWEEN`

6. Sorting Results with `ORDER BY`

7. Combining Filtering and Sorting

8. Filtering with Aggregate Functions

Note

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