Examples - Create Logical Vew
These examples apply to creating a logical view within a file definition.
The file definition used in these examples is called CUSMST (Customer master file) and contains these fields:
|
Field |
Description |
Type |
Len |
Dec |
|
CUSTNO |
Customer number (primary key) |
S |
7 |
0 |
|
NAME |
Name of person / organization |
A |
30 |
|
|
ADDR1 |
Address line 1 |
A |
35 |
|
|
ADDR2 |
Address line 2 |
A |
35 |
|
|
ADDR3 |
Address line 3 |
A |
35 |
|
|
POSTCD |
Post code |
A |
4 |
|
|
STATE |
State mnemonic |
A |
3 |
|
|
ACTIVE |
Active / inactive flag |
A |
1 |
|
|
CREDIT |
Credit limit |
P |
11 |
2 |
|
AMTDUE |
Current amount due all accounts |
P |
11 |
2 |
|
ACCTYP |
Customer account type |
P |
1 |
0 |
Example 1
Create a logical view/file called CUSMSTV1 that will order CUSMST by NAME and allow generic searching by NAME:
Logical view name : CUSMSTV1
Desc of logical view : Customer master by customer name
Access path maint opt : IMMED Unique? NO Dynamic select? NO
Key field details
Field Description A/D S/U/A
NAME___ A _
_______ _ _ +
_______ _ _ +
+
Example 2
Create a logical view/file called CUSMSTV2 that will order CUSMST by STATE then POSTCD (i.e.POSTCD within STATE):
Logical view name : CUSMSTV2
Desc of logical view : Cust master by state and postcode
Access path maint opt : IMMED Unique? NO Dynamic select? NO
Key field details
Field Description A/D S/U/A
STATE____ _ _
POSTCD___ _ _
_ _ +
Note that no ascend/descend value has been specified. In this case the value will default to ascend for both keys.
Example 3
Create a logical view/file called CUSMSTS1 that will order CUSMST by CUSTNO. Only records with ACTIVE = 'Y' are to be "visible" when using this logical view:
Logical view name : CUSMSTS1
Desc of logical view : Active customers by customer no
Access path maint opt : IMMED Unique? NO Dynamic select? NO
Key field details:
Field Description A/D S/U/A
CUSTNO__ _ _
________ _ _ +
________ _ _ +
+
Select/Omit criteria:
AND/OR SELECT/OMIT Field Operation(s)
SELECT_____ ACTIVE__ COMP(EQ 'Y')______
Example 4
Create a logical view/file called CUSMSTS2 that will order CUSMST by AMTDUE. Only records with CREDIT greater than 100000 and AMTDUE greater than or equal to 20000 are to be visible via this view. Records are to be ordered from highest amount due to lowest amount due. Use the dynamic select feature as well.
Logical view name : CUSMSTS2
Desc of logical view : High credit, large debt customers
Access path maint opt: IMMED Unique? NO Dynamic select? YES
Key field details:
Field Description A/D S/U/A
AMTDUE__ D S
________ _ _ +
________ _ _ +
+
Select/Omit criteria :
AND/OR SELECT/OMIT Field Operation(s)
SELECT____ CREDIT____ COMP(GT 100000)_______
AND __________ AMTDUE____ COMP(GE 20000)________
Note that since no entry was made in the SELECT/OMIT column for the second select/omit statement the 2 statements are ANDed together. In this case only customers with CREDIT greater than 100000 AND AMTDUE greater than or equal to 20000 are selected.
Example 5
Create a logical view/file called CUSMSTS3 that will order CUSMST by CREDIT. Only records with CREDIT greater than 100000 or AMTDUE greater than or equal to 20000 are to be visible via this view.
Logical view name : CUSMSTS3
Desc of logical view : High credit or large debt customers
Access path maint opt : IMMED Unique? NO Dynamic select? NO
Key field details:
Field Description A/D S/U/A
CREDIT__ _ _
________ _ _ +
________ _ _ +
+
Select/Omit criteria:
AND/OR SELECT/OMIT Field Operation(s)
SELECT____ CREDIT____ COMP(GT 100000)________
OR SELECT____ AMTDUE____ COMP(GE 20000)_________
Note that since an entry was made in the SELECT/OMIT column for the second select/omit statement the 2 statements are read together. In this case only customers with CREDIT greater than 100000 OR . AMTDUE greater than or equal to 20000 are selected.
Example 6
Create a logical view/file called CUSMSTS4 that will order CUSMST by STATE and CUSTNO. Only records with a STATE of NSW, VIC or QLD are to be visible via this view.
Logical view name : CUSMSTS4
Desc of logical view : East coast customers by state, cust
Access path maint opt : IMMED Unique? NO Dynamic select? NO
Key field details
Field Description A/D S/U/A
STATE___ _ _
CUSTNO__ _ _
________ _ _ +
+
Select/Omit criteria:
AND/OR SELECT/OMIT Field Operation(s)
SELECT_____ STATE____ COMP(EQ 'NSW')________
OR SELECT_____ STATE____ COMP(EQ 'VIC')________
OR SELECT_____ STATE____ COMP(EQ 'QLD')________
An identical condition can be made using the VALUES keyword:
Select/Omit criteria
AND/OR SELECT/OMIT Field Operation(s)
SELECT_____ STATE_ VALUES('NSW' 'VIC' 'QLD')
Example 7
Create a logical view/file called CUSMSTS5 that will order CUSMST by CUSTNO. Only records with an ACCTYP value of 2, 3 or 4 are to be visible via this view.
Logical view name : CUSMSTS5
Desc of logical view : Customers with type 2, 3 or 4 accounts
Access path maint opt : IMMED Unique? NO Dynamic select? NO
Key field details:
Field Description A/D S/U/A
CUSTNO__ _ _
________ _ _ +
________ _ _ +
Select/Omit criteria:
AND/OR SELECT/OMIT Field Operation(s)
SELECT_____ ACCTYP____ COMP(EQ 2)_____
OR SELECT_____ ACCTYP____ COMP(EQ 3)_____
OR SELECT_____ ACCTYP____ COMP(EQ 4)______
The select /omit condition could also be expressed as:
SELECT_____ ACCTYP____ COMP(GE 2)________
AND ACCTYP____ COMP(LE 4)_________
or :
SELECT_____ ACCTYP___ VALUES(2 3 4)______
or :
SELECT_____ ACCTYP____ RANGE(2 4)______