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having:
 select salesman_id ,count(*) from customer   group by salesman_id having count(*)>2;

Q1.From the following table, write a SQL query to find the maximum order (purchase) amount for each customer. 
The customer ID should be in the range 3002 and 3007(Begin and end values are included.).
Filter the rows for maximum order (purchase) amount is higher than 1000. 
Return customer id and maximum purchase amount.

Sample table: orders

ord_no      purch_amt   ord_date    customer_id  salesman_id
----------  ----------  ----------  -----------  -----------
70001       150.5       2012-10-05  3005         5002
70009       270.65      2012-09-10  3001         5005
70002       65.26       2012-10-05  3002         5001
70004       110.5       2012-08-17  3009         5003
70007       948.5       2012-09-10  3005         5002
70005       2400.6      2012-07-27  3007         5001
70008       5760        2012-09-10  3002         5001
70010       1983.43     2012-10-10  3004         5006
70003       2480.4      2012-10-10  3009         5003
70012       250.45      2012-06-27  3008         5002
70011       75.29       2012-08-17  3003         5007
70013       3045.6      2012-04-25  3002         5001

ans:-
select customer_id  , max(purch_amt) from orders where customer_id between 3002 and 3007 group by customer_id  having max(purch_amt) >1000;


Q2.From the following table, write a SQL query to determine the 
maximum order (purchase) amount generated by each salesperson. 
Filter the rows for the salesperson ID is in the range 5003 and 
5008 (Begin and end values are included.).
 Return salesperson id and maximum purchase amount.

Sample table: orders

ord_no      purch_amt   ord_date    customer_id  salesman_id
----------  ----------  ----------  -----------  -----------
70001       150.5       2012-10-05  3005         5002
70009       270.65      2012-09-10  3001         5005
70002       65.26       2012-10-05  3002         5001
70004       110.5       2012-08-17  3009         5003
70007       948.5       2012-09-10  3005         5002
70005       2400.6      2012-07-27  3007         5001
70008       5760        2012-09-10  3002         5001
70010       1983.43     2012-10-10  3004         5006
70003       2480.4      2012-10-10  3009         5003
70012       250.45      2012-06-27  3008         5002
70011       75.29       2012-08-17  3003         5007
70013       3045.6      2012-04-25  3002         5001



__________________________________________________________________________________________________________________________-

Update statement:
update clause is used for modify the existing records int the table.
when we omit the where clause all records in the table will be modify(update).

syntax:
update table_name set column1= value1, column2= value2,....
where condition

exa:-
update orders set item="laptop" where order_id=3;
------------------------------------------------------------------------------------------------------


difference between alter and update.

alter:1. data defination lang(DDL)
      2.alter command will perform structure level.
      3.syntax alter table tablename (modify/add/rename) Drop column column_name
      4. this command make changes with the table structure.
      5. alter command works on attributes(columns) 


update:1. data manipulation lang(DML)
       2.update command will perform on data level.
       3 syntax :-update table_name set column_name=values
       4. this command make changes the data inside table.
        5. update cammand works on perticular field(rows) in the table


_______________________________________________________________________________________________________________
exercise:

Write a SQL statement to change the email column of employees table with 'not available' for those employees whose department_id is 80 and gets a commission_pct is less than .20

Here is the sample table employees.

+-------------+-------------+-------------+----------+--------------------+------------+------------+----------+----------------+------------+---------------+
| EMPLOYEE_ID | FIRST_NAME  | LAST_NAME   | EMAIL    | PHONE_NUMBER       | HIRE_DATE  | JOB_ID     | SALARY   | COMMISSION_PCT | MANAGER_ID | DEPARTMENT_ID |
+-------------+-------------+-------------+----------+--------------------+------------+------------+----------+----------------+------------+---------------+
|         100 | Steven      | King        | SKING    | 515.123.4567       | 1987-06-17 | AD_PRES    | 24000.00 |           0.00 |          0 |   		  90 |
|         101 | Neena       | Kochhar     | NKOCHHAR | 515.123.4568       | 1987-06-18 | AD_VP      | 17000.00 |           0.00 |        100 |            90 |
|         102 | Lex         | De Haan     | LDEHAAN  | 515.123.4569       | 1987-06-19 | AD_VP      | 17000.00 |           0.00 |        100 |            90 |
|         103 | Alexander   | Hunold      | AHUNOLD  | 590.423.4567       | 1987-06-20 | IT_PROG    |  9000.00 |           0.00 |        102 |            60 |
|         104 | Bruce       | Ernst       | BERNST   | 590.423.4568       | 1987-06-21 | IT_PROG    |  6000.00 |           0.00 |        103 |            60 |
|         105 | David       | Austin      | DAUSTIN  | 590.423.4569       | 1987-06-22 | IT_PROG    |  4800.00 |           0.00 |        103 |            60 |
|         106 | Valli       | Pataballa   | VPATABAL | 590.423.4560       | 1987-06-23 | IT_PROG    |  4800.00 |           0.00 |        103 |            60 |
|         107 | Diana       | Lorentz     | DLORENTZ | 590.423.5567       | 1987-06-24 | IT_PROG    |  4200.00 |           0.00 |        103 |            60 |
|         108 | Nancy       | Greenberg   | NGREENBE | 515.124.4569       | 1987-06-25 | FI_MGR     | 12000.00 |           0.00 |        101 |           100 |
|         109 | Daniel      | Faviet      | DFAVIET  | 515.124.4169       | 1987-06-26 | FI_ACCOUNT |  9000.00 |           0.00 |        108 |           100 |
|         110 | John        | Chen        | JCHEN    | 515.124.4269       | 1987-06-27 | FI_ACCOUNT |  8200.00 |           0.00 |        108 |           100 |
|         111 | Ismael      | Sciarra     | ISCIARRA | 515.124.4369       | 1987-06-28 | FI_ACCOUNT |  7700.00 |           0.00 |        108 |           100 |
|         112 | Jose Manuel | Urman       | JMURMAN  | 515.124.4469       | 1987-06-29 | FI_ACCOUNT |  7800.00 |           0.00 |        108 |           100 |
|         113 | Luis        | Popp        | LPOPP    | 515.124.4567       | 1987-06-30 | FI_ACCOUNT |  6900.00 |           0.00 |        108 |           100 |
|         114 | Den         | Raphaely    | DRAPHEAL | 515.127.4561       | 1987-07-01 | PU_MAN     | 11000.00 |           0.00 |        100 |            30 |
|         115 | Alexander   | Khoo        | AKHOO    | 515.127.4562       | 1987-07-02 | PU_CLERK   |  3100.00 |           0.00 |        114 |            30 |
|         116 | Shelli      | Baida       | SBAIDA   | 515.127.4563       | 1987-07-03 | PU_CLERK   |  2900.00 |           0.00 |        114 |            30 |
|         117 | Sigal       | Tobias      | STOBIAS  | 515.127.4564       | 1987-07-04 | PU_CLERK   |  2800.00 |           0.00 |        114 |            30 |
|         118 | Guy         | Himuro      | GHIMURO  | 515.127.4565       | 1987-07-05 | PU_CLERK   |  2600.00 |           0.00 |        114 |            30 |
|         119 | Karen       | Colmenares  | KCOLMENA | 515.127.4566       | 1987-07-06 | PU_CLERK   |  2500.00 |           0.00 |        114 |            30 |
|         120 | Matthew     | Weiss       | MWEISS   | 650.123.1234       | 1987-07-07 | ST_MAN     |  8000.00 |           0.00 |        100 |            50 |
|         121 | Adam        | Fripp       | AFRIPP   | 650.123.2234       | 1987-07-08 | ST_MAN     |  8200.00 |           0.00 |        100 |            50 |
|         122 | Payam       | Kaufling    | PKAUFLIN | 650.123.3234       | 1987-07-09 | ST_MAN     |  7900.00 |           0.00 |        100 |            50 |
|         123 | Shanta      | Vollman     | SVOLLMAN | 650.123.4234       | 1987-07-10 | ST_MAN     |  6500.00 |           0.00 |        100 |            50 |
|         124 | Kevin       | Mourgos     | KMOURGOS | 650.123.5234       | 1987-07-11 | ST_MAN     |  5800.00 |           0.00 |        100 |            50 |
|         125 | Julia       | Nayer       | JNAYER   | 650.124.1214       | 1987-07-12 | ST_CLERK   |  3200.00 |           0.00 |        120 |            50 |
|         126 | Irene       | Mikkilineni | IMIKKILI | 650.124.1224       | 1987-07-13 | ST_CLERK   |  2700.00 |           0.00 |        120 |            50 |
|         127 | James       | Landry      | JLANDRY  | 650.124.1334       | 1987-07-14 | ST_CLERK   |  2400.00 |           0.00 |        120 |            50 |
|         128 | Steven      | Markle      | SMARKLE  | 650.124.1434       | 1987-07-15 | ST_CLERK   |  2200.00 |           0.00 |        120 |            50 |
|         129 | Laura       | Bissot      | LBISSOT  | 650.124.5234       | 1987-07-16 | ST_CLERK   |  3300.00 |           0.00 |        121 |            50 |
|         130 | Mozhe       | Atkinson    | MATKINSO | 650.124.6234       | 1987-07-17 | ST_CLERK   |  2800.00 |           0.00 |        121 |            50 |
|         131 | James       | Marlow      | JAMRLOW  | 650.124.7234       | 1987-07-18 | ST_CLERK   |  2500.00 |           0.00 |        121 |            50 |
|         132 | TJ          | Olson       | TJOLSON  | 650.124.8234       | 1987-07-19 | ST_CLERK   |  2100.00 |           0.00 |        121 |            50 |
|         133 | Jason       | Mallin      | JMALLIN  | 650.127.1934       | 1987-07-20 | ST_CLERK   |  3300.00 |           0.00 |        122 |            50 |
|         134 | Michael     | Rogers      | MROGERS  | 650.127.1834       | 1987-07-21 | ST_CLERK   |  2900.00 |           0.00 |        122 |            50 |
|         135 | Ki          | Gee         | KGEE     | 650.127.1734       | 1987-07-22 | ST_CLERK   |  2400.00 |           0.00 |        122 |            50 |
|         136 | Hazel       | Philtanker  | HPHILTAN | 650.127.1634       | 1987-07-23 | ST_CLERK   |  2200.00 |           0.00 |        122 |            50 |
|         137 | Renske      | Ladwig      | RLADWIG  | 650.121.1234       | 1987-07-24 | ST_CLERK   |  3600.00 |           0.00 |        123 |            50 |
|         138 | Stephen     | Stiles      | SSTILES  | 650.121.2034       | 1987-07-25 | ST_CLERK   |  3200.00 |           0.00 |        123 |            50 |
|         139 | John        | Seo         | JSEO     | 650.121.2019       | 1987-07-26 | ST_CLERK   |  2700.00 |           0.00 |        123 |            50 |
|         140 | Joshua      | Patel       | JPATEL   | 650.121.1834       | 1987-07-27 | ST_CLERK   |  2500.00 |           0.00 |        123 |            50 |
|         141 | Trenna      | Rajs        | TRAJS    | 650.121.8009       | 1987-07-28 | ST_CLERK   |  3500.00 |           0.00 |        124 |            50 |
|         142 | Curtis      | Davies      | CDAVIES  | 650.121.2994       | 1987-07-29 | ST_CLERK   |  3100.00 |           0.00 |        124 |            50 |
|         143 | Randall     | Matos       | RMATOS   | 650.121.2874       | 1987-07-30 | ST_CLERK   |  2600.00 |           0.00 |        124 |            50 |
|         144 | Peter       | Vargas      | PVARGAS  | 650.121.2004       | 1987-07-31 | ST_CLERK   |  2500.00 |           0.00 |        124 |            50 |
|         145 | John        | Russell     | JRUSSEL  | 011.44.1344.429268 | 1987-08-01 | SA_MAN     | 14000.00 |           0.40 |        100 |            80 |
|         146 | Karen       | Partners    | KPARTNER | 011.44.1344.467268 | 1987-08-02 | SA_MAN     | 13500.00 |           0.30 |        100 |            80 |
|         147 | Alberto     | Errazuriz   | AERRAZUR | 011.44.1344.429278 | 1987-08-03 | SA_MAN     | 12000.00 |           0.30 |        100 |            80 |
|         148 | Gerald      | Cambrault   | GCAMBRAU | 011.44.1344.619268 | 1987-08-04 | SA_MAN     | 11000.00 |           0.30 |        100 |            80 |
|         149 | Eleni       | Zlotkey     | EZLOTKEY | 011.44.1344.429018 | 1987-08-05 | SA_MAN     | 10500.00 |           0.20 |        100 |            80 |
|         150 | Peter       | Tucker      | PTUCKER  | 011.44.1344.129268 | 1987-08-06 | SA_REP     | 10000.00 |           0.30 |        145 |            80 |
|         151 | David       | Bernstein   | DBERNSTE | 011.44.1344.345268 | 1987-08-07 | SA_REP     |  9500.00 |           0.25 |        145 |            80 |
|         152 | Peter       | Hall        | PHALL    | 011.44.1344.478968 | 1987-08-08 | SA_REP     |  9000.00 |           0.25 |        145 |            80 |
|         153 | Christopher | Olsen       | COLSEN   | 011.44.1344.498718 | 1987-08-09 | SA_REP     |  8000.00 |           0.20 |        145 |            80 |
|         154 | Nanette     | Cambrault   | NCAMBRAU | 011.44.1344.987668 | 1987-08-10 | SA_REP     |  7500.00 |           0.20 |        145 |            80 |
|         155 | Oliver      | Tuvault     | OTUVAULT | 011.44.1344.486508 | 1987-08-11 | SA_REP     |  7000.00 |           0.15 |        145 |            80 |
|         156 | Janette     | King        | JKING    | 011.44.1345.429268 | 1987-08-12 | SA_REP     | 10000.00 |           0.35 |        146 |            80 |
|         157 | Patrick     | Sully       | PSULLY   | 011.44.1345.929268 | 1987-08-13 | SA_REP     |  9500.00 |           0.35 |        146 |            80 |
|         158 | Allan       | McEwen      | AMCEWEN  | 011.44.1345.829268 | 1987-08-14 | SA_REP     |  9000.00 |           0.35 |        146 |            80 |
|         159 | Lindsey     | Smith       | LSMITH   | 011.44.1345.729268 | 1987-08-15 | SA_REP     |  8000.00 |           0.30 |        146 |            80 |
|         160 | Louise      | Doran       | LDORAN   | 011.44.1345.629268 | 1987-08-16 | SA_REP     |  7500.00 |           0.30 |        146 |            80 |
|         161 | Sarath      | Sewall      | SSEWALL  | 011.44.1345.529268 | 1987-08-17 | SA_REP     |  7000.00 |           0.25 |        146 |            80 |
|         162 | Clara       | Vishney     | CVISHNEY | 011.44.1346.129268 | 1987-08-18 | SA_REP     | 10500.00 |           0.25 |        147 |            80 |
|         163 | Danielle    | Greene      | DGREENE  | 011.44.1346.229268 | 1987-08-19 | SA_REP     |  9500.00 |           0.15 |        147 |            80 |
|         164 | Mattea      | Marvins     | MMARVINS | 011.44.1346.329268 | 1987-08-20 | SA_REP     |  7200.00 |           0.10 |        147 |            80 |
|         165 | David       | Lee         | DLEE     | 011.44.1346.529268 | 1987-08-21 | SA_REP     |  6800.00 |           0.10 |        147 |            80 |
|         166 | Sundar      | Ande        | SANDE    | 011.44.1346.629268 | 1987-08-22 | SA_REP     |  6400.00 |           0.10 |        147 |            80 |
|         167 | Amit        | Banda       | ABANDA   | 011.44.1346.729268 | 1987-08-23 | SA_REP     |  6200.00 |           0.10 |        147 |            80 |
|         168 | Lisa        | Ozer        | LOZER    | 011.44.1343.929268 | 1987-08-24 | SA_REP     | 11500.00 |           0.25 |        148 |            80 |
|         169 | Harrison    | Bloom       | HBLOOM   | 011.44.1343.829268 | 1987-08-25 | SA_REP     | 10000.00 |           0.20 |        148 |            80 |
|         170 | Tayler      | Fox         | TFOX     | 011.44.1343.729268 | 1987-08-26 | SA_REP     |  9600.00 |           0.20 |        148 |            80 |
|         171 | William     | Smith       | WSMITH   | 011.44.1343.629268 | 1987-08-27 | SA_REP     |  7400.00 |           0.15 |        148 |            80 |
|         172 | Elizabeth   | Bates       | EBATES   | 011.44.1343.529268 | 1987-08-28 | SA_REP     |  7300.00 |           0.15 |        148 |            80 |
|         173 | Sundita     | Kumar       | SKUMAR   | 011.44.1343.329268 | 1987-08-29 | SA_REP     |  6100.00 |           0.10 |        148 |            80 |
      | 

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