We typically use theCOUNT()function to count the number of rows in a result set. Often, we include a WHERE condition in the query to filter rows before performing the count. When we need to count the same column differently, we usually write multiple queries with different WHERE conditions....
What i meant is that the OUT Of@ParamCould be FirstName Or LastName Or Age Or Gender to be use on the Where Condition at the left hand side of the Query Thanks Monday, July 14, 2014 5:23 AM Yes, using Dynamic Sql, you can check against different columns dynamically. Tuesday, Jul...
Having explored the basics of the SQL INSERT INTO statement, let’s see our librarian in action. We’ll walk through some examples to help you understand how to use this command effectively. Inserting a Single Row Imagine we have a table namedemployeeswith three columns:id,name, andposition....
SQL Server query optimizer decides to use an index seek operator when the operator cost is low and it can easily find matching records using the B-Tree structure. An index seek operator provides significant performance gains. In the below picture, theEstimated Number of Rows to be Read...
How to use if else condition in case statement using sql server 2008? how to use IF statement in subquery how to use IF-THEN-ELSE in a inline table-valued function how to use iif in sql server 2008? How to use like operator in dynamic query? How to use LIKE operator with Varible in...
A search condition is made up of one or morepredicates, or expressions that can evaluate one or more value expressions and return a result of either “true,”“false,” or “unknown.” In SQL, avalue expression— also sometimes referred to as ascalar expression— is any expression that wil...
MySQL allows you to present your column alias in mixed case.You might be wondering what use aliasing is if you are not using command-line SQL. Fair enough. Have you ever wondered how report builders work? Some day, when you are asked to write a report generator, you’ll remember this ...
When not to use indexes Apart from knowing the importance of a column order inside the index, it’s also important to know when indexes won’t work. Keep in mind that each time you add an index, we need to scan the whole table. That’s why you don’t need to use indexes when: ...
WHERE Condition But this syntax is applicable in SQL only not in MySQL, but we can have the same results of the above statement in MySQL in other ways. How to insert data in a temporary table using MySQL? To copy data from any existing table into the temporary table in MySQL, we shoul...
Using SQL AVG with GROUP BY The last two queries used the WHERE clause to filter the rows we are plan to use the AVG function on. In one query, we filtered the results by a result from the AVG function. In the second, we used WHERE to filter the results that it will use to gener...