The SampleQueryProvider class provides a set of pre-defined SQL query samples for various use cases, allowing developers to test and analyze query performance, optimization, and potential issues. These samples cover a range of scenarios, including optimized queries, queries with potential performance issues, and complex queries with multiple joins and subqueries.

The SampleQueryProvider class offers the following public static members:

• GetOptimizedQuery: Returns a sample optimized SQL query.
  • Parameters: None
  • Return value: A string representing the optimized query.
  • Throws: None
• GetSelectStarQuery: Returns a sample SQL query using SELECT *.
  • Parameters: None
  • Return value: A string representing the query.
  • Throws: None
• GetNPlusOneQuery: Returns a sample SQL query that demonstrates the N+1 query issue.
  • Parameters: None
  • Return value: A string representing the query.
  • Throws: None
• GetImplicitConversionQuery: Returns a sample SQL query that demonstrates implicit conversion.
  • Parameters: None
  • Return value: A string representing the query.
  • Throws: None
• GetNonSargableQuery: Returns a sample SQL query that demonstrates a non-SARGable query.
  • Parameters: None
  • Return value: A string representing the query.
  • Throws: None
• GetComplexJoinQuery: Returns a sample SQL query with complex joins.
  • Parameters: None
  • Return value: A string representing the query.
  • Throws: None
• GetLeadingWildcardQuery: Returns a sample SQL query with a leading wildcard.
  • Parameters: None
  • Return value: A string representing the query.
  • Throws: None
• GetOrConditionQuery: Returns a sample SQL query with an OR condition.
  • Parameters: None
  • Return value: A string representing the query.
  • Throws: None
• GetSubqueryQuery: Returns a sample SQL query with a subquery.
  • Parameters: None
  • Return value: A string representing the query.
  • Throws: None
• GetDistinctQuery: Returns a sample SQL query using the DISTINCT keyword.
  • Parameters: None
  • Return value: A string representing the query.
  • Throws: None
• GetSimpleQuery: Returns a sample simple SQL query.
  • Parameters: None
  • Return value: A string representing the query.
  • Throws: None
• GetAggregationQuery: Returns a sample SQL query with aggregation functions.
  • Parameters: None
  • Return value: A string representing the query.
  • Throws: None
• GetCteQuery: Returns a sample SQL query using a Common Table Expression (CTE).
  • Parameters: None
  • Return value: A string representing the query.
  • Throws: None
• GetVeryComplexQuery: Returns a sample very complex SQL query.
  • Parameters: None
  • Return value: A string representing the query.
  • Throws: None
• GetAllSamples: Returns a dictionary containing all sample queries.
  • Parameters: None
  • Return value: A dictionary with query names as keys and query strings as values.
  • Throws: None
• GetRandomSample: Returns a random sample query.
  • Parameters: None
  • Return value: A string representing the random query.
  • Throws: None
• GetSamplesByIssueType: Returns a dictionary containing sample queries grouped by issue type.
  • Parameters: None
  • Return value: A dictionary with issue types as keys and lists of query strings as values.
  • Throws: None

Here are two examples of using the SampleQueryProvider class:

// Example 1: Get a sample optimized query
string optimizedQuery = SampleQueryProvider.GetOptimizedQuery();
Console.WriteLine(optimizedQuery);

// Example 2: Get all sample queries and iterate over them
Dictionary<string, string> allSamples = SampleQueryProvider.GetAllSamples();
foreach (var sample in allSamples)
{
    Console.WriteLine($"Query: {sample.Key}");
    Console.WriteLine($"SQL: {sample.Value}");
}

• All methods are static, making them thread-safe and accessible without creating an instance of the class.
• The GetRandomSample method may return any of the available sample queries, and its behavior is non-deterministic.
• The GetSamplesByIssueType method returns a dictionary with issue types as keys, which can be used to categorize and analyze the sample queries.
• The sample queries provided by this class are for demonstration and testing purposes only and may not be suitable for production use without modification.