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I'm not going to do your homework, but I can point you in the right direction: Normalization and Joins.
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Hi friends. I have 2 coulmns in a table (RealPersonID and CompanyID). They are foreign keys. My problem is that either of them is always 0 and the other one is none zero.
So i want to do that in only one query:
x=(Select CompanyID from Table1)
y=(Select RealPersonID from Table1)
if x!=0 (select companyName from Companies where companyID=x)
else (select personName from Person where personID=y)
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Non tested!
Select IsNull(C.CompanyName, P.PersonName) Contact
From LinkTable L
Left Join ComapanyTable C on C.CompanyID = L.CompanyID
Left Join PersonTable P on P.RealPersonID = L.RealPersonID
This may help you understand joins Visual Representation of SQL Joins[^]
Never underestimate the power of human stupidity
RAH
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I will try my best to describe this, it's the same PHP project from my post below, my next biggest hurdle to jump here.
I'm trying to solve this through SQL, without having to change much of the the PHP Code
I have this line of code, in which it takes a query from the calling class which passes it to this class that contains the line below. Sort of crazy or genius.
$lc_query = '(SELECT SQL_CALC_FOUND_ROWS ' . substr($pc_query, 6) . ') LIMIT ' . (($ln_page - 1) * $ln_pagesize) . ', ' . $ln_pagesize;
So I changed the code from using the old mysql handle to the new PDO. I could not find a way to pass an array of parameter tokens to this class, because the token count could be any number of them. The classic trying to bind parameters in a loop failure.
Original way:
Class 1, generate the query, and passes it to class 2
Class 2, calculate page count, then uses the line above to wrap the passed in query and transmit it.
So I did this:
class 1: generates the dynamic query, makes a PDO instance, bind parameters, pass PDO to class 2
class 2: receives the PDO handle, and executes.
So far so good, it works good, stable, but I need the calculations in the Class 2 for page indexing.
I can't figure out how to reintegrate the above statement in class 2 where the page numbers are generated.
I was hoping I would be able to extract the query out of the PDO object, and reconstruct it. Plus I don't think the line above works in PDO.
If you have any thoughts, comments or past experience with this, I'd appreciate it!
Class 1
$cmd_sp = $PDOClass->QUERY($lc_query);
if ($b_mfgName) $cmd_sp->bindParam(':mfgName', $lc_mfg, PDO::PARAM_STR);
if ($b_deptID) $cmd_sp->bindParam(':deptID', $pn_dept_id, PDO::PARAM_INT);
if ($b_partnerID) $cmd_sp->bindParam(':partnerID', $go_sitedict['partner_id'], PDO::PARAM_INT);
$SPClass = new SPClass(
$cmd_sp,
$cmd_sp_mfg,
FALSE,
'',
$ll_debug
);
Class 2:
$lc_query = '(SELECT SQL_CALC_FOUND_ROWS ' . substr($pc_query, 6) . ') LIMIT ' . (($ln_page - 1) * $ln_pagesize) . ', ' . $ln_pagesize;
try {
$cmd_showProduct->execute();
}
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I'm upgrading a PHP website that uses MySQL to use PDO, pretty big project but I have this one SQL Query that won't play ball with me. I'm no expert in SQL Queries, my biggest weakness, but I'm just easter egg hunting on this one.
I get this error Unknown column 'p.prod_id' in 'on clause'
The script works on the customers production system, but it has never worked on my development system that I had to build to work on the project. It was originally written for the original mysql handle or object. I forget what version of MySQL they are using, but I'm using the lastest windows version.
I'm Interested in you just looking at it, and if you see or know something, then perhaps you can point me in the right direction.
I came to the conclusion that perhaps its poorly written, and somehow it worked, but in PDO, which is more strict, it won't fly.
SELECT DISTINCT p.prod_id, p.model, p.showpricing, p.image_file, p.image_width, p.image_height, p.image_border, p.name, m.manufacturer,
CASE WHEN sp.price IS NULL THEN 0 ELSE sp.price END AS list_price,
CASE WHEN sp.price IS NULL OR ssp.discount IS NULL THEN 0 ELSE sp.price - ssp.discount END AS sale_price,
CASE WHEN NOW() BETWEEN p.mfgrebatestart AND p.mfgrebateend THEN p.mfgrebate ELSE 0 END AS mfgrebate
FROM comm_product p, comm_manufacturer m
INNER JOIN comm_dept_prod dp ON p.prod_id = dp.prod_id
INNER JOIN comm_partners_products pa ON p.prod_id = pa.prod_id
LEFT JOIN comm_sku_price sp ON p.default_sku_id = sp.sku_id AND NOW()
BETWEEN sp.date_start AND sp.date_end
LEFT JOIN comm_sku_sale_price ssp ON p.default_sku_id = ssp.sku_id AND NOW()
BETWEEN ssp.date_start AND ssp.date_end
WHERE pa.p_id = :partnerID
AND p.mfg_id = m.mfg_id
AND p.avail_type < 3 AND p.image_file > ''
AND p.model NOT LIKE 'EBAY-%'
AND p.dept_ad = 1
AND dp.dept_id = :deptID
ORDER BY rand() LIMIT 4
comm_product, I copied the columns from mysql workbench
table comm_product
`prod_id`, `model`, `name`, `list_order`,
`image_file`, `image_width`, `image_height`, `image_border`,
`big_image_file`, `big_image_width`, `big_image_height`, `big_image_border`,
`feature_image_file`, `mfgrebate`, `mfgrebatestart`, `mfgrebateend`,
`taxable`, `comp_name`, `comp_price`, `item_desc`,
`attr_label1`, `attr_label2`, `attr_label3`, `attr_label4`,
'attr_label5`, `special_note`, `manager_note`, `page_id`,
`pdf_file`, `edittrack`, `date_created`, `time_created`,
`user_created`, `date_edited`, `user_edited`, `mfg_id`,
`condition`, `mfgrebatepost`, `mfgrebatefile`, `mfgrebatetype`,
`default_sku_id`, `preselect_default_sku`, `clean_pdf`, `avail_type`,
`showpricing`, `free_shipping`, `window_title`, `meta_description`,
`meta_keywords`, `page_header`, `dept_ad`, `seoname`,
`feed_title`, `feed_upc`, `feed_product_type`
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First guess.. does prod_id exist in comm_product? Since p.prod_id is being referenced and p is the alias for comm_product, I'd start there.
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Thanks for looking at it. I did check that. I went ahead and edited my post and added that table to it for inspection. I'll probably need to add all the tables.
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What I can see is a mixture of ANSI joins and an implicit join. And I can understand if the optimizer pukes on that.
Try using all ANSI Joins:
SELECT DISTINCT p.prod_id, p.model, p.showpricing, p.image_file, p.image_width, p.image_height, p.image_border, p.name, m.manufacturer,
CASE WHEN sp.price IS NULL THEN 0 ELSE sp.price END AS list_price,
CASE WHEN sp.price IS NULL OR ssp.discount IS NULL THEN 0 ELSE sp.price - ssp.discount END AS sale_price,
CASE WHEN NOW() BETWEEN p.mfgrebatestart AND p.mfgrebateend THEN p.mfgrebate ELSE 0 END AS mfgrebate
FROM comm_product p
INNER JOIN comm_manufacturer m ON p.mfg_id = m.mfg_id
INNER JOIN comm_dept_prod dp ON p.prod_id = dp.prod_id
INNER JOIN comm_partners_products pa ON p.prod_id = pa.prod_id
LEFT JOIN comm_sku_price sp ON p.default_sku_id = sp.sku_id AND NOW()
BETWEEN sp.date_start AND sp.date_end
LEFT JOIN comm_sku_sale_price ssp ON p.default_sku_id = ssp.sku_id AND NOW()
BETWEEN ssp.date_start AND ssp.date_end
WHERE pa.p_id = :partnerID
AND p.avail_type < 3 AND p.image_file > ''
AND p.model NOT LIKE 'EBAY-%'
AND p.dept_ad = 1
AND dp.dept_id = :deptID
ORDER BY rand() LIMIT 4
Politicians are always realistically manoeuvering for the next election. They are obsolete as fundamental problem-solvers.
Buckminster Fuller
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Wow thanks.
I ran it in the mysql workbence. it didn't produce an error and ran clean, but it didn't product any rows on :partner = 1000 and :dept = 52.
But it's a step closer.
Oh wait, changed the dept to 54, and got rows!
Cool.
Let me give it a test run in the code, should work fine. I may have another one today
This was way over my head here. It's hard to be a programmer, art guy, HTML and CSS all at once. The SQL stuff seems to be an expertise on a higher level.
Thanks Jorgen, your the best!
I don't understand the ANSI JOIN versus the implicit, guess I can Google that to learn exactly what was wrong.
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jkirkerx wrote: Wow thanks
My pleasure.
jkirkerx wrote: I don't understand the ANSI JOIN versus the implicit, guess I can Google that to
learn exactly what was wrong.
Yes, or even better, in this case, Wikipedia[^].
Politicians are always realistically manoeuvering for the next election. They are obsolete as fundamental problem-solvers.
Buckminster Fuller
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I plugged it in, pretty sure I got the translation right because I don't get a SQL error and the SQL Query matches when I print it out on the screen.
It's really close, but I guess it's suppose to produce a result set of 4 rows on almost every dept ID
This is out of my league here. oh well.
Thanks for help, At least I know my code changes work, and I can do testing with it.
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hi.i want write insert procedure in access.
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And your QUESTION is!
I think Access has a macro function so step through the insert while recording a macro and inspect the SQL code generated.
Never underestimate the power of human stupidity
RAH
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Hi guys,
PLZ help me!
Scenario - My client has 2 server machine. one is database server with oracle 10g database 64-bit. Another server(new one) is windows 2008 server which has an .net 2.0+3.5 website hosted. This website make use of System.data.oracleClient dll . Problem is that this app is not able to connect to oracle 10g database server though it is able to connect to some other 11g R2 database server. On this app server we have also tried to install oracle 10g 32-bit client but still can't access. Tnsping and sqlplus is working fine. Pls. suggest.
Solution that we tried :-
- Gave permission and added various users to oracle directory and sub-directory like IIS_Iuser,network service, anonymous etc.
Possible culprit:-
- Earlier on this app server oracle 11g 32-bit client was installed. So my client has although worked on to remove it by manually deleting folder , deleting registeries , extra home directories. but it looks like a possible reason to me..
Note - we use some internal ddl for dataaccess , so im not able to see actual error just some OLEDB exception.
Pls help
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abhi17_6 wrote: Problem is that this app is not able to connect to oracle 10g database server
though it is able to connect to some other 11g R2 database server.
A connectivity issue is not normally a code issue. Causes
- There is in fact no way to connect from server A to B. Perhaps because of firewall or IP routing.
- The host and/or port used on the client is wrong.
Simple test...
- Log in to the client box.
- Telnet to the Oracle box using the exact same host and port of the connection data.
If telnet connects then you probably have connectivity. If not then it is one of the above - don't look at code until the telnet test works.
It might work for you and not work for a server depending on the user the server runs under and how you logged in.
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@jshell - we have installed oracle client 10g 32 bit also on web app server machine. and my client is able to do tnsping and use sqlplus here.
Questions-
- do i need to use telnet utility from my App server or from my oracle server machine? u mentioned client box, which one is it?
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The "web app" would be the client machine.
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Hello,
I am able to create a directory by using sql as
Exec master.dbo.xp_cmdshell 'C:\MyTest\<<date>>'
but when I tried to create director name with space as
Exec master.dbo.xp_cmdshell 'C:\My Test'\<<date>> then its throwing error.
can anybody please help me how to create directory with space in SQL
Samar
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Surround the directory string with double quotes
=========================================================
I'm an optoholic - my glass is always half full of vodka.
=========================================================
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Thank you very much for your reply
but I already did as
Exec master.dbo.xp_cmdshell '"C:\Temp\My Test "'
but still getting facing problem
Samar
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Samarjeet Singh@india wrote: Exec master.dbo.xp_cmdshell 'C:\My Test'\<<DATE>> then its throwing
error.
What's that? always include those details in your question.
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For example if I tried to run in sql
Exec master.dbo.xp_cmdshell '"C:\Temp\My Test"'
Then I am getting following 3 rows of messages
1- 'C:\Temp\My' is not recognized as an internal or external command
2-operable program or batch file.
3- NULL
Thanks
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Thank u very much !!!!!
its working in sql2008 but client is running in older version(Sql2000) and in older version its unable to find the reference and producing following msg
Server: Msg 2812, Level 16, State 62, Line 1
Could not find stored procedure
is any other method so that its working in SQL2000 as well
Thanks in advance
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For SQL 2000, you'll need to stick with xp_cmdshell, but you need to put mkdir in front of the path you want to create:
Exec master.dbo.xp_cmdshell 'mkdir "C:\My Test\<<DATE>>"'
http://www.sqlservercentral.com/Forums/Topic604168-8-1.aspx[^]
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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