Unlike theONclause, we use theWHEREclause to filter records after theJOINhas been performed. When we use theWHEREclause instead of theONclause toJOINthe tables, it functions as an implicitJOINcondition for anINNER JOIN. TheWHEREclause can introduce extra conditions to filter the result set, ena...
The example uses an inner join to display only those records from both tables that match the join condition based on the Cust_ID field.注意 The SELECT statement uses local table aliases to distinguish the same field name, Cust_ID, in both tables and an ORDER BY clause to organize the ...
For example, a SERIALIZABLE transaction could issue a SELECT statement that reads all rows whose key values match the condition BETWEEN 'AAA' AND 'CZZ'. A key-range lock on the key values in the range from 'AAA' to 'CZZ' prevents other transactions from inserting rows with key values ...
The column that is used in the WHERE clause in an equal to (=), greater than (>), less than (<), or BETWEEN search condition, or participates in a join, should be placed first. Additional columns should be ordered based on their level of distinctness, that is, from the most...
Can I use LEN or DATALENGTH in a WHERE clause? Can I use OUTER JOIN on 2 columns at the same time? Can row_number() work in UNION STATEMENTS ? Can someone explain just exactly why xp_cmdshell is such a massive risk?! Can SQL Profiler give you the Missing Index information? Can Symm...
The WHERE clause could be used in different CRUD (Create, Read, Update, Delete) operations. Filtering a SQL SELECT Statement A WHERE clause can be added to a SELECT statement to only return the rows that match a specific condition. For example, suppose we need to retrieve the information of...
The following example converts the money column SalesYTD to an int and then to a char(20) column so that it can be used with the LIKE clause. USE AdventureWorks2008R2; GO SELECT p.FirstName, p.LastName, s.SalesYTD, s.BusinessEntityID FROM Person.Person AS p JOIN Sales.SalesPerson AS...
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This is useful when filtering data with a left outer join. The [ON] clause can be useful when we need to return all the rows from the left table and only those rows from the right table which match the condition of the On clause. ...