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4 Ιουλ 2012 · Please try this query with inner join and a sub-query: SELECT * FROM EMP_MASTER T1 INNER JOIN TRANSFER T2 ON T1.employee_id =T2.employee_id WHERE T2.DATE_OF_TRANSFER=(SELECT MAX(T3.DATE_OF_TRANSFER) FROM TRANSFER T3 WHERE T3.employee_id =T2.employee_id );
Introduction. When you join tables, the optimizer has to decide how to combine the data sets. There are three key algorithms to do this: Hash Joins. (Sort) Merge Joins. Nested Loops.
5 Οκτ 2018 · Oracle SQL JOINs. Understand syntax, usage, types of JOINs at one place. (INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL JOIN)
Oracle JOINS are used to retrieve data from multiple tables. An Oracle JOIN is performed whenever two or more tables are joined in a SQL statement. There are 4 different types of Oracle joins: Oracle INNER JOIN (or sometimes called simple join) Oracle LEFT OUTER JOIN (or sometimes called LEFT JOIN)
Oracle Joins. Summary: in this tutorial, you will learn various kinds of Oracle joins that allow you to query data from two or more related tables. Oracle join is used to combine columns from two or more tables based on the values of the related columns.
Nested loops joins are useful when the database joins small subsets of data, the database joins large sets of data with the optimizer mode set to FIRST_ROWS, or the join condition is an efficient method of accessing the inner table.
25 Μαΐ 2008 · Nested tables let you implement ID dependent tables. ID dependent tables are solely dependent on another table. Data modelers choose between ID- and non-ID dependent tables. The non-ID dependent table is the most common. It describes implementing ordinary tables. ID dependent tables require you to nest a table in another.
