oracleplsql04(完整版)
【正文】 umn names that are in multiple tables. ? Improve performance by using table prefixes. ? Distinguish columns that have identical names but reside in different tables by using column aliases. 411 SELECT , , , , FROM employees e , departments d WHERE = 。 … 420 Summary In this lesson, you should have learned how to use joins to display data from multiple tables in: ? Oracle proprietary syntax for versions 8i and earlier ? SQL: 1999 pliant syntax for version 9i 421 演講完畢，謝謝觀看！ 。 … 415 Outer Joins EMPLOYEES DEPARTMENTS There are no employees in department 190. … 416 Outer Joins Syntax ? You use an outer join to also see rows that do not meet the join condition.
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