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Three-table join Non-equi-join
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More than two tables are joined together by adding additional JOIN clauses. The comparison operator in the join predicate is other than equal (=). An equi-join that matches rows based on all the columns that share the same name between the joined tables. An equi-join based on the explicitly identified column names that share the same name in the joined tables. An equi-join of a table to itself with each row matched with other rows in the same table.
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SELECT NAME, QUOTA, TARGET FROM SALESREPS, OFFICES WHERE QUOTA > TARGET; SELECT FROM WHERE AND ORDER_NUM, AMOUNT, DESCRIPTION ORDERS, PRODUCTS MFR = MFR_ID PRODUCT = PRODUCT_ID;
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SELECT NAME, QUOTA, TARGET FROM SALESREPS JOIN OFFICES ON QUOTA > TARGET;
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Natural join Join with USING clause Self-join Outer Joins2,3
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SELECT ORDER_NUM, AMOUNT, DESCRIPTION FROM ORDERS NATURAL JOIN PRODUCTS;4 SELECT ORDER_NUM, AMOUNT, DESCRIPTION FROM ORDERS JOIN PRODUCTS USING (MFR, PRODUCT);5 SELECT EMPS.NAME, MGRS.NAME FROM SALESREPS EMPS JOIN SALESREPS MGRS ON EMPS.MANAGER = MGRS.EMPL_NUM;
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n/a SELECT EMPS.NAME, MGRS.NAME FROM SALESREPS EMPS, SALESREPS MGRS WHERE EMPS.MANAGER = MGRS.EMPL_NUM;
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Full outer join
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SELECT FROM WHERE UNION SELECT FROM WHERE
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* GIRLS, BOYS GIRLS.CITY = BOYS.CITY(+) * GIRLS, BOYS GIRLS.CITY(+) = BOYS.CITY; SELECT * FROM GIRLS FULL OUTER JOIN BOYS ON GIRLS.CITY = BOYS.CITY;
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Adds a NULL-extended row to the query results for each unmatched row of each joined table.
Natural full outer join Full outer join with USING clause Full outer join with keyword OUTER implied Left outer join Outer Joins2,3 Left outer join with USING clause
SELECT * FROM GIRLS NATURAL FULL OUTER JOIN BOYS; SELECT * FROM GIRLS FULL OUTER JOIN BOYS USING (CITY); SELECT * FROM GIRLS FULL JOIN BOYS USING (CITY); SELECT * FROM GIRLS LEFT OUTER JOIN BOYS ON GIRLS.CITY = BOYS.CITY;
A full outer join that matches rows based on all the columns that share the same name between the joined tables. A full outer join based on the explicitly identified column names that share the same name in the joined tables. Many SQL implementations allow the keyword OUTER to be left out because it is implied by the keyword FULL. Adds a NULL-extended row to the query results for each unmatched row of the first (left) table.
n/a SELECT * FROM GIRLS, BOYS WHERE GIRLS.CITY = BOYS.CITY(+);
n/a SELECT * FROM GIRLS, BOYS WHERE GIRLS.CITY(+) = BOYS.CITY;
SELECT * FROM GIRLS LEFT OUTER JOIN BOYS USING (CITY); SELECT * FROM GIRLS RIGHT OUTER JOIN BOYS ON GIRLS.CITY = BOYS.CITY; SELECT * FROM GIRLS RIGHT OUTER JOIN BOYS USING (CITY);
A left outer join based on the explicitly identified column names that share the same name in the joined tables. Adds a NULL-extended row to the query results for each unmatched row of the second (right) table. A right outer join based on the explicitly identified column names that share the same name in the joined tables.
Right outer join Right outer join with USING clause Other Joins
Cross join
SELECT * FROM GIRLS, BOYS; SELECT FROM UNION SELECT FROM * GIRLS ALL * BOYS;
SELECT * FROM GIRLS CROSS JOIN BOYS; SELECT FROM UNION SELECT FROM * GIRLS ALL * BOYS;
Explicitly requests the Cartesian product, which is the product consisting of all possible pairs of rows from the two tables. Technically not a join; the SELECTs process independently and the result sets are then concatenated by the UNION operator.
Union join
1 2 3 4
Inner joins have the potential to lose information if the tables being joined contain unmatched rows. Outer joins do not lose information because they add back the unmatched rows. Oracle syntax used in Old Syntax examples. This query is for illustration only because no columns share the same name in the ORDERS and PRODUCTS tables of the sample database. If you run this or any query that performs a natural join on two tables with no matching column names between them, many brands of SQL DBMS will return the Cartesian product. This query is for illustration only and will not run on the sample database because the PRODUCTS table does not contain columns named MFR and PRODUCT.
TABLE 7-1
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