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How To Write an Inner Join with the WHERE Clause
How To Write an Inner Join with the WHERE Clause? - Oracle DBA FAQ - Understanding SQL SELECT Query Statements If you don't want to use the INNER JOIN ... ON clause to write an inner join, you can put the join condition in the WHERE clause as shown in the following query example: SQL> SELECT d.depar... 2007-04-19, 5140👍, 0💬

How To Write a Left Outer Join with the WHERE Clause
How To Write a Left Outer Join with the WHERE Clause? - Oracle DBA FAQ - Understanding SQL SELECT Query Statements If you don't want to use the LEFT OUTER JOIN ... ON clause to write a left outer join, you can use a special criteria in the WHERE clause as "left_table.column = right_table.column(+)".... 2007-04-19, 5271👍, 0💬

How To Name Query Output Columns
How To Name Query Output Columns? - Oracle DBA FAQ - Understanding SQL SELECT Query Statements Each column in the query output has a default name. If you don't like the default name, you can specify a new name for any column in the query output by using the AS clause. The following statement shows y... 2007-04-19, 5334👍, 0💬

What Is a Subquery
What Is a Subquery? - Oracle DBA FAQ - Understanding SQL SELECT Query Statements A subquery is a SELECT statement used as part of the selection criteria of the main SELECT statement. The subquery specified in the WHERE clause will be evaluated repeated on each row of the selection base table. The ou... 2007-04-19, 4963👍, 0💬

How To Use Subqueries with the IN Operator
How To Use Subqueries with the IN Operator? - Oracle DBA FAQ - Understanding SQL SELECT Query Statements A subquery can be used with the IN operator as "expression IN (subquery)". The subquery should return a single column with one or more rows to form a list of values to be used by the IN operation... 2007-04-19, 4826👍, 0💬

How To Use Subqueries with the EXISTS Operator
How To Use Subqueries with the EXISTS Operator? - Oracle DBA FAQ - Understanding SQL SELECT Query Statements A subquery can be used with the EXISTS operator as "EXISTS (subquery)", which returns true if the subquery returns one or more rows. The following statement is a good example of "EXISTS (subq... 2007-04-19, 4963👍, 0💬

How To Count Groups Returned with the GROUP BY Clause
How To Count Groups Returned with the GROUP BY Clause? - Oracle DBA FAQ - Understanding SQL SELECT Query Statements If you use the COUNT(*) function on groups returned with the GROUP BY clause, it will count the number of rows within each group, not the number of groups. If you want to count the num... 2007-04-19, 5319👍, 0💬

How To Use Subqueries in the FROM clause
How To Use Subqueries in the FROM clause? - Oracle DBA FAQ - Understanding SQL SELECT Query Statements If you have a query returning many rows of data, and you want to perform another query on those rows, you can put the first query as a subquery in the FROM clause of the second query. The following... 2007-04-19, 4773👍, 0💬

How To Return Top 5 Rows
How To Return Top 5 Rows? - Oracle DBA FAQ - Understanding SQL SELECT Query Statements If you want the query to return only the first 5 rows, you can use the pseudo column called ROWNUM in the WHERE clause. ROWNUM contains the row number of each returning row from the query. The following statement ... 2007-04-18, 5645👍, 0💬

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.NET C C++ CSS DBA General HTML Java JavaScript JSP JUnit MySQL Networking Oracle Perl Perl PHP PL/SQL RSS Software QA SQL Server Struts Unix Windows XHTML XML