1. From 10th Edition and 8th Edition
MORE SQL
From 10th Edition
and 8th Edition

2. WHERE clause can refer to a set of values WHERE <attribute> IN
(value1, value2,…) 2

3. WILDCARDS SELECT * FROM <table>
WHERE <attribute> LIKE ‘xxx*’;
Note: * stands for any sequence of characters in Access.
WHERE <attribute> LIKE ‘*xxx*’; 3

4. CALCULATIONS SELECT SUM (<attribute>)
FROM <table>; -- not so good
NOTE: n-a-n stands for new attribute name
In these notes (but not in Access) a – at the end of a query is to be interpreted as a comment about the query. (courtesy T. Weber)
SELECT SUM (<attribute>) AS <n-a-n>
FROM <table>; better
FROM <table>
WHERE <attribute> <rel-op> <value>;

5. More Built-In Calculators
SELECT AVG(<attribute>) AS <n-a-n>
FROM <table>;
SELECT MIN(<attribute>) AS < n-a-n >
SELECT MAX(<attribute>) AS < n-a-n >

6. More Built-In Calculators
SELECT COUNT(*) AS <n-a-n>
FROM <table>;
SELECT COUNT(<attribute>) AS <n_a_n>
SELECT COUNT( DISTINCT <attribute>) AS <n_a_n>

7. Other possibilities missing values are looked for using IS NULL
single column sorting is done using ORDER BY
multiple column sorting is done using
ORDER BY <attribute1, attribute2, …> 7

8. SQL Arithmetic
SELECT <attribute1> * <attribute2> AS <n-a-n>
FROM <table>;
SELECT <attribute1> * <attribute2> AS <n-a-n>, <attribute> 8

9. SQL Arithmetic
SELECT <attribute1> + ‘in’ + <attribute2> AS <n-a-n>FROM <table>;
SELECT DISTINCT RTRIM(<attribute1>) + ‘in’ + RTRIM(<attribute2>) AS <n-a-n>
FROM <table>; 9

10. GROUPING SELECT <attribute>, COUNT (*) AS <n-a-n>
FROM <table>
GROUP BY <attribute>;
SELECT <attribute1>, AVG<attribute2> AS <n-a-n>

11. GROUPING
SELECT <attribute1>, <attribute2> , COUNT (*) AS <n-a-n>
FROM <table>
GROUP BY <attribute1>, <attribute2>;
SELECT <attribute> COUNT(*) AS <n-a-n>
WHERE <attribute ><rel-op> <value>
GROUP BY <attribute>
ORDER BY <n-a-n>

12. MULTI-TABLE QUERIES SELECT SUM<attribute1> AS <n-a-n>
FROM <table1>
WHERE <attribute2> IN (value1, value2,…valueN);
SELECT <attribute2 >
FROM <table2>
WHERE <attribute3> <rel-op> <value>;

13. MULTI-TABLE QUERIES SELECT SUM<attribute1> AS <n-a-n>
FROM <table1>
WHERE attribute2 IN
(SELECT <attribute2 >
FROM <table2>
WHERE <attribute3> <rel-op> <value>;

14. JOINS SELECT * FROM <table1>, <table2>;
WHERE <table1.attribute> <rel-op> <table2.attribute>