Q: how can i write PL/SQL block to check prerequisite?

Hello...
I designed an application using sql*plus statment for creating database and developer for creating forms, for on-line registration system for universties,
so I need to teach me how can I write pl/sql block to check the prerequisite, taken courses, and complete hours for the students who wants register the courses via Internet.
thanks alot in advance
kindly send the answers a.s.a.p

please repost this in the SQL & PL/SQL forum
thanks - OTN

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Hi all
I wriote this SQ L statement in Ms SQL Server. How do I write this sql command in Oracle?
ALTER VIEW dbo.ConsumptionAS SELECT TOP 100 PERCENT ID,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200710' AND NbrDaysUsed != 0 THEN (QtyUsed/ Days_Usage) * 748.05 ELSE 0 END)) AS Oct2007,
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CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200801' AND NbrDaysUsed != 0 THEN (QtyUsed/ Days_Usage) * 748.05 ELSE 0 END)) AS Jan2008,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200802' AND NbrDaysUsed != 0 THEN (QtyUsed/ Days_Usage) * 748.05 ELSE 0 END)) AS Feb2008,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200803' AND NbrDaysUsed != 0 THEN (QtyUsed/ Days_Usage) * 748.05 ELSE 0 END)) AS Mar2008,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200804' AND NbrDaysUsed != 0 THEN (QtyUsed/ Days_Usage) * 748.05 ELSE 0 END)) AS Apr2008,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200805' AND NbrDaysUsed != 0 THEN (QtyUsed/ Days_Usage) * 748.05 ELSE 0 END)) AS May2008,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200806' AND NbrDaysUsed != 0 THEN (QtyUsed/ Days_Usage) * 748.05 ELSE 0 END)) AS Jun2008 ,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200807' AND NbrDaysUsed != 0 THEN (QtyUsed/ Days_Usage) * 748.05 ELSE 0 END)) AS Jul2008 ,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200808' AND NbrDaysUsed != 0 THEN (QtyUsed/ NbrDaysUsed) * 748.05 ELSE 0 END)) AS Aug2008,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200809' AND NbrDaysUsed != 0 THEN (QtyUsed NbrDaysUsed) * 748.05 ELSE 0 END)) AS Sep2008
FROM dbo.MasterConsumption WHERE YEAR_MONTH >= '200710' AND YEAR_MONTH <= '200809' GROUP BY ID ORDER BY ID
I am very interested in this part:
SUM(CASE WHEN YEAR_MONTH = '200710' AND NbrDaysUsed != 0 THEN (QtyUsed/ Days_Usage) * 748.05 ELSE 0 END)) AS Oct2007
thanks
Edited by: user631364 on Oct 27, 2008 8:25 AM
Edited by: user631364 on Oct 27, 2008 8:26 AM
Edited by: user631364 on Oct 27, 2008 8:27 AM

Thank you!!
Now let me aslk the second part of my question.
This sql command:
ALTER VIEW dbo.ConsumptionAS SELECT TOP 100 PERCENT ID,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200710' AND NbrDaysUsed != 0 THEN (QtyUsed/ Days_Usage) * 748.05 ELSE 0 END)) AS Oct2007,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200711' AND NbrDaysUsed != 0 THEN (QtyUsed/ Days_Usage) * 748.05 ELSE 0 END)) AS Nov2007,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200712' AND NbrDaysUsed != 0 THEN (QtyUsed/ Days_Usage) * 748.05 ELSE 0 END)) AS Dec2007,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200801' AND NbrDaysUsed != 0 THEN (QtyUsed/ Days_Usage) * 748.05 ELSE 0 END)) AS Jan2008,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200802' AND NbrDaysUsed != 0 THEN (QtyUsed/ Days_Usage) * 748.05 ELSE 0 END)) AS Feb2008,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200803' AND NbrDaysUsed != 0 THEN (QtyUsed/ Days_Usage) * 748.05 ELSE 0 END)) AS Mar2008,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200804' AND NbrDaysUsed != 0 THEN (QtyUsed/ Days_Usage) * 748.05 ELSE 0 END)) AS Apr2008,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200805' AND NbrDaysUsed != 0 THEN (QtyUsed/ Days_Usage) * 748.05 ELSE 0 END)) AS May2008,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200806' AND NbrDaysUsed != 0 THEN (QtyUsed/ Days_Usage) * 748.05 ELSE 0 END)) AS Jun2008 ,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200807' AND NbrDaysUsed != 0 THEN (QtyUsed/ Days_Usage) * 748.05 ELSE 0 END)) AS Jul2008 ,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200808' AND NbrDaysUsed != 0 THEN (QtyUsed/ NbrDaysUsed) * 748.05 ELSE 0 END)) AS Aug2008,
CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = '200809' AND NbrDaysUsed != 0 THEN (QtyUsed NbrDaysUsed) * 748.05 ELSE 0 END)) AS Sep2008
FROM dbo.MasterConsumption WHERE YEAR_MONTH >= '200710' AND YEAR_MONTH <= '200809' GROUP BY ID ORDER BY ID
was created with this query in SQL Server and then I saved it in a store procedure, that I scheduled to run montlhy
SET ANSI_NULLS ON
DECLARE @SQLString NVARCHAR(4000)
/* Build the SQL string once.*/
SET @SQLString = 'ALTER VIEW dbo.Consumption AS SELECT TOP 100 PERCENT ID, CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = ' +
"'" + dbo.CONLastMonth_fn(getdate(), month(getdate()) - 12) +
"'" +
' AND NbrDaysUsed != 0 THEN (QtyUsed/ NbrDaysUsed) * 748.05 ELSE 0 END)) AS ' +
dbo.CONMonthInEnglish(getdate(), month(getdate()) - 12) +
… (GOES FROM current month -12 to current month -1)
, CONVERT(decimal(10, 2), SUM(CASE WHEN YEAR_MONTH = ' +
"'" + dbo.CONLastMonth_fn(getdate(), month(getdate()) - 1) +"'" +
' AND NbrDaysUsed != 0 THEN (QtyUsed/ NbrDaysUsed) * 748.05 ELSE 0 END)) AS ' +
dbo.CONMonthInEnglish(getdate(), month(getdate()) - 1) +
' FROM dbo.MasterConsumption WHERE YEAR_MONTH >= ' +
"'" + dbo.CONLastMonth_fn (getdate(), month(getdate())-12 ) +"'" +
' AND YEAR_MONTH <= ' +
"'" + dbo.CONLastMonth_fn (getdate(), month(getdate())-1 ) +"'" +
' GROUP BY ID ORDER BY ID '
EXEC sp_executesql @SQLString
Is that something that can be done in Oracle in the same way?
Do you use another approach?
please advice
Edited by: user631364 on Oct 27, 2008 10:19 AM
Edited by: user631364 on Oct 27, 2008 10:21 AM
Edited by: user631364 on Oct 27, 2008 10:21 AM
Edited by: user631364 on Oct 27, 2008 10:22 AM
Edited by: user631364 on Oct 27, 2008 10:23 AM
Edited by: user631364 on Oct 27, 2008 10:23 AM
Edited by: user631364 on Oct 27, 2008 10:24 AM

How can I improve below SQL performance.

Hi,
How can I improve below SQL performance. This SQL consumes CPU and occures wait events. It is running every 10 seconds. When I look at the session information from Enterprise Manager I can see that "Histogram for Wait Event: PX Deq Credit: send blkd"
I created some indexes. I heard that the indexes are not used when there is a NULL but when I checked the xecution plan It uses index.
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FROM EXPRESS.invoices i
WHERE i.nbr IS NOT NULL
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AND i.SUB_TYPE='COD'
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| Id | Operation | Name | Rows | Bytes | Cost | TQ |IN-OUT| PQ Distrib |
| 0 | SELECT STATEMENT | | 349 | 6980 | 77 | | | |
| 1 | PX COORDINATOR | | | | | | | |
| 2 | PX SEND QC (RANDOM) | :TQ10000 | 349 | 6980 | 77 | Q1,00 | P->S | QC (RAND) |
| 3 | PX BLOCK ITERATOR | | 349 | 6980 | 77 | Q1,00 | PCWC | |
|* 4 | INDEX FAST FULL SCAN| INVC_TRANS_INDX | 349 | 6980 | 77 | Q1,00 | PCWP | |
Predicate Information (identified by operation id):
4 - filter("I"."NBR" IS NOT NULL AND "I"."EXTRACT_BATCH" IS NULL AND "I"."SUB_TYPE"='COD')
Note
- 'PLAN_TABLE' is old version
- cpu costing is off (consider enabling it)
Statistics
141 recursive calls
0 db block gets
5568 consistent gets
0 physical reads
0 redo size
319 bytes sent via SQL*Net to client
458 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
1 sorts (memory)
0 sorts (disk)
0 rows processed
Instance Efficiency Percentages (Target 100%)
Buffer Nowait %: 100.00
Redo NoWait %: 100.00
Buffer Hit %: 99.70
In-memory Sort %: 100.00
Library Hit %: 99.81
Soft Parse %: 99.77
Execute to Parse %: 63.56
Latch Hit %: 90.07
Parse CPU to Parse Elapsd %: 0.81
% Non-Parse CPU: 98.88
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Event     Waits     Time(s)     Avg Wait(ms)     % Total Call Time     Wait Class
latch: library cache     12,626     16,757     1,327     62.6     Concurrency
CPU time          5,712          21.Mar
latch: session allocation     1,848,987     1,99     1     07.Nis     Other
PX Deq Credit: send blkd     1,242,265     981     1     03.Tem     Other
PX qref latch     1,405,819     726     1     02.Tem     Other
The database version is 10.2.0.1 but we haven't installed the patch 10.2.0.5. yet.
I am waiting your comments.
Thanks in advance

Welcome to the forum.
I created some indexes. I heard that the indexes are not used when there is a NULL but when I checked the xecution plan It uses index. What columns are indexed?
And what do:
select i.sub_type
,      count(*)
from   express.invoices i
where i.nbr is not null
and    i.extract_batch is null
group by i.sub_type; and
select i.sub_type
,      count(*)
from   express.invoices i
group by i.sub_type; return?
Also, try use the {noformat}{noformat} tag when posting examples/execution plans etc.
See: HOW TO: Post a SQL statement tuning request - template posting for more tuning instructions.
It'll make a big difference:
SELECT i.ID
FROM EXPRESS.invoices i
WHERE i.nbr IS NOT NULL
AND i.EXTRACT_BATCH IS NULL
AND i.SUB_TYPE='COD'
Explain Plan from Toad
SELECT STATEMENT CHOOSECost: 77 Bytes: 6,98 Cardinality: 349
     4 PX COORDINATOR
          3 PX SEND QC (RANDOM) SYS.:TQ10000 Cost: 77 Bytes: 6,98 Cardinality: 349
               2 PX BLOCK ITERATOR Cost: 77 Bytes: 6,98 Cardinality: 349
                    1 INDEX FAST FULL SCAN INDEX EXPRESS.INVC_TRANS_INDX Cost: 77 Bytes: 6,98 Cardinality: 349
Execution Plan from Sqlplus
| Id | Operation | Name | Rows | Bytes | Cost | TQ |IN-OUT| PQ Distrib |
| 0 | SELECT STATEMENT | | 349 | 6980 | 77 | | | |
| 1 | PX COORDINATOR | | | | | | | |
| 2 | PX SEND QC (RANDOM) | :TQ10000 | 349 | 6980 | 77 | Q1,00 | P->S | QC (RAND) |
| 3 | PX BLOCK ITERATOR | | 349 | 6980 | 77 | Q1,00 | PCWC | |
|* 4 | INDEX FAST FULL SCAN| INVC_TRANS_INDX | 349 | 6980 | 77 | Q1,00 | PCWP | |
Predicate Information (identified by operation id):
4 - filter("I"."NBR" IS NOT NULL AND "I"."EXTRACT_BATCH" IS NULL AND "I"."SUB_TYPE"='COD')
Note
- 'PLAN_TABLE' is old version
- cpu costing is off (consider enabling it)
Statistics
141 recursive calls
0 db block gets
5568 consistent gets
0 physical reads
0 redo size
319 bytes sent via SQL*Net to client
458 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
1 sorts (memory)
0 sorts (disk)
0 rows processed
Instance Efficiency Percentages (Target 100%)
Buffer Nowait %: 100.00
Redo NoWait %: 100.00
Buffer Hit %: 99.70
In-memory Sort %: 100.00
Library Hit %: 99.81
Soft Parse %: 99.77
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Latch Hit %: 90.07
Parse CPU to Parse Elapsd %: 0.81
% Non-Parse CPU: 98.88
Top 5 Timed Events
Event     Waits     Time(s)     Avg Wait(ms)     % Total Call Time     Wait Class
latch: library cache     12,626     16,757     1,327     62.6     Concurrency
CPU time          5,712          21.Mar
latch: session allocation     1,848,987     1,99     1     07.Nis     Other
PX Deq Credit: send blkd     1,242,265     981     1     03.Tem     Other
PX qref latch     1,405,819     726     1     02.Tem     Other

Q: how can i write PL/SQL block to check prerequisite?

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