HELP!!! ASAP!! Procedures and Triggers

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HELP!!! ASAP!! Procedures and Triggers

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sonygupta
Starting Member

3 Posts

Posted - 2005-10-16 : 15:07:25

I need to create a procedure to output mean and deviation AND then I also need to create a trigger. Below is the table 'Account' I made.. but the procedure and trigger I made below that is not correct. Can someone revise this for me? I just can't figure it out.

Here is the 'Account' table I made earlier:

create table Account(Account_Number varchar(6)NOT NULL PRIMARY KEY, Branch_Name varchar(12)NOT NULL REFERENCES Branch (Branch_Name), Balance money)

insert into Account values(10101, 'First Bank', 5500)

insert into Account values(20202, 'US Bank', 3550)

insert into Account values(30303, 'Commerce', 7550)

-------------------------------------------------------------------------

Now I need to output the Mean and Standard Deviation of the above Account. So I tried this code but I'm not sure if its right since when I Analyze it, some values come out as 'null'.

CREATE PROCEDURE project2question2 AS

DECLARE @Mean MONEY

DECLARE @Deviation MONEY

SET @Mean = (SELECT avg(cast(Balance as float)) as mean from Account)

SET @Deviation = (SELECT Balance, STDEV(Balance) st_deviation

FROM Account

GROUP BY Balance)

-------------------------------------------------------------------------

The second question was to create a Trigger that would output the name "Account" and the time of change/update to it. So I had this so far, but I KNOW its not right, so can anyone revise this for me? I basically need to create a trigger named ActionHistory that would have two columns: TableName and ActionTime. They should tie to my Account table so that when it was changed/updated then the name 'Account' would appear under TableName in my trigger, and the datetime of update would appear under ActionTime. But I just can't figure this one out.

Create table ActionHistory(TableName varchar(12) NOT NULL, ActionTime datetime NOT NULL)

CREATE TRIGGER trigger_ex2

ON ActionHistory

AFTER INSERT, UPDATE

AS

BEGIN

UPDATE ActionHistory

SET Account = UPPER(LName) WHERE TableName in (SELECT TableName FROM ActionHistory)

SET Loan = UPPER(LName) WHERE IDN in (SELECT TableName FROM ActionHistory)

-------------------------------------------------------

If someone could give me these codes I would be very grateful. I know you guys are the SQL wizzards. Thanks. (by the way, I use SQL 2000 edition)

- SOnia

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2005-11-05 : 06:58:54

>>when I Analyze it, some values come out as 'null'.

See if this work

SELECT avg(cast(isnull(Balance,0) as float)) as Mean, STDEV(Isnull(Balance,0)) as st_deviation from Account

Madhivanan

Failing to plan is Planning to fail

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