what is the difference between having clause and where clause in sql server?
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2) WHERE clause is used for filtering rows and it applies on each and every row, while HAVING clause is used to filter groups in SQL. 3) One syntax level difference between WHERE and HAVING clause is that, former is used before GROUP BY clause, while later is used after GROUP BY clause.
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A query is a question or inquiry to a set of data. We use SQL, or Structured Query Language, to retrieve data from databases. ... An SQL statement needs a SELECT clause to tell it to start looking for data, a FROM clause to tell it from which table(s) to pull data, and a WHERE clause to restrict/filter the results.
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Basic Differences between Stored Procedure and Function in SQL Server. The function must return a value but in Stored Procedure it is optional. Even a procedure can return zero or n values. Functions can have only input parameters for it whereas Procedures can have input or output parameters.
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Example - Two Conditions in the WHERE Clause (OR Condition) You can use the OR condition in the WHERE clause to test multiple conditions where the record is returned if any one of the conditions are met.
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The biggest difference is that oList. Where(e => e.Name == "John") is type of IEnumerable<Employee>, but oList. Find(e => e.Name == "John") is a type of Employee. ... Find(e => e.Name == "John"); both return employee data.
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An SQL JOIN clause is used to combine rows from two or more tables, based on a common field between them. ... INNER JOIN: returns rows when there is a match in both tables. LEFT JOIN: returns all rows from the left table, even if there are no matches in the right table.
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The ON clause defines the relationship between the tables. The WHERE clause describes which rows you are interested in. Many times you can swap them and still get the same result, however this is not always the case with a left outer join.
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Few differences between SQL and HQL. SQL is based on relational database model whereas HQL is a combination of OOPS with Relational database concept. SQL manipulates data stored in tables and modifies its rows and columns while HQL is concerned about objects and its properties.
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what is difference between NULL and ISNULL in SQL Server 2008? ISNULL is a function which is verify the data is null or not if null then it will replace the value which is assigned in the function. NULL is default values if no data present. Commit is a TCL command which is used to make database transaction permanent.
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There is no difference in meaning. There is a difference in use. Relative clauses—the sort of clause you use, “which is blue” / “that is blue”, which tells us something more about the noun referred to by which or that—are of two sorts: restrictive and nonrestrictive.
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INNER JOIN is ANSI syntax whereas the WHERE syntax is more relational model oriented. The INNER JOIN is generally considered more readable and it is a cartesian product of the tables, especially when you join lots of tables but the result of two tables JOIN'ed can be filtered on matching columns using the WHERE clause.
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When you use a Left Outer join without an On or Where clause, there is no difference between the On and Where clause. ... First we see the result of the left join using neither an On nor a Where clause. Both produce the same result as in the following: Select * from employeeTable E Left Outer join departmenttable D on E.
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Procedure can return zero or n values whereas function can return one value which is mandatory. Procedures can have input/output parameters for it whereas functions can have only input parameters. ... UDF can be used in the SQL statements anywhere in the WHERE/HAVING/SELECT section where as Stored procedures cannot be.
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The main difference between WHERE and HAVING clause comes when used together with GROUP BY clause, In that case WHERE is used to filter rows before grouping and HAVING is used to exclude records after grouping. This is the most important difference and if you remember this, it will help you write better SQL queries.
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Both USING and ON clauses can be used for equijoins and nonequijoins. A maximum of one pair of columns can be joined between two tables using the ON clause. The ON clause can be used to join tables on columns that have different names but compatible data types.
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There is a very important difference if the source of the data is Entity Framework: Find will find entities in the 'added' state that are not yet persisted, but Where will not. This is by design. Find is only implemented in List<T> , while Where(). FirstOrDefault() works with all IEnumerable<T> .
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Only two subqueries can be placed at one level. A subquery can be used only in SQL query statements. A subquery can appear on either side of a comparison operator. There is no limit on the number of subquery levels in the WHERE clause of a SELECT statement.