currently working with 2 temporary views A & B . while selecting records from individual views it gives results. But when creating 3rd view C with join of A & B it works but when we run any select query on 3rd view C it gives error "Error in SQL statement: package.TreeNodeException: execute, tree: Exchange hashpartitioning"
Please help whats going wrong here.
Possible reason could be, skewed join. i.e., the fields you are joining could have multiple combinations. This can happen mainly when the joining fields also possess null values in both the views then it could result in multiple null joined with multiple nulls.
It can be avoided by adding another possible field. Else join non null values separate and append null values from both sides.
If this does not solve the purpose, do share us some code snippet, we can try replicating and solve the issue.
Related
I am having some trouble with a query in Crystal 2008. I have two tables with columns that are loosely related, both contain addresses. One table column is just a street name while the other is a street name plus some additional info. I want to find all records where these have the same street name and only show those. Example below:
Address
AddressB
123 St
123 St, ABC City
123 St
345 St, ABC City
I have tried using a formula such as below
if({AddressB} startswith {Address}) then {AddressB} else 'ERROR'
I have also tried this with LIKE and as well as * wildcards. Nothing seems to work. I will admit I am pretty amateur-ish with SQL and crystal so formulas are a new frontier for me writing reports. Also I should note that tables are linked appropriately with inner joins.
Any help would be greatly appreciated!
This should work. Perhaps your {Address} column is padded with spaces, so try:
IF ({AddressB} startswith Trim({Address})) THEN {AddressB} ELSE 'ERROR'
Test the effect of replacing the reference to the column name with the static text value that you "think" is in that column.
If you get a different behavior, what you think is in that column is not what is actually in that column. For example, the column might contain non-printable characters. You can get rid of those using the Replace function.
If you don't get a different behavior, then show us the expression with the static text values. That would allow us to replicate the behavior and understand the situation.
Note: the problem might be in your table join logic. If you have no join condition, then all records in TableA would join to all the records in TableB. In that case, you need to place the fields in the detail section to get a proper sense of what is being compared to what. Or rethink your join logic. Perhaps you should move one table to a subreport, or a SQL Expression instead of trying to include both tables in the main report.
I have this situation. Starting from a table, I have to check all the records that match a key. If records are found, I have to check another table using a key from the first table and so on, more on less on five levels. There is a way to do this in a recursive way, or I have to write all the code "by hand"? The language I am using is Visual Fox Pro. If this is is not possible, is it al least possible to use recursion to popolate a treeview?
You can set a relation between tables. For example:
USE table_1.dbf IN 0 SHARED
USE table_2.dbf IN 0 SHARED
SET ORDER TO TAG key_field OF table_2.cdx IN table_2
SET RELATION TO key_field INTO table_2 ADDITIVE IN table_1
First two commands open table_1 and table_2. Then you have to set the order/index of table_2. If you don't have an index for the key field then this will not work. The final command sets the relation between the two tables on the key field.
From here you can browse both tables and table_2's records will be filtered based on table_1's key field. Hope this helps.
If the tables have similar structure or you only need to look at a few fields, you could write a recursive routine that receives the name of the table, the key to check, and perhaps the fields you need to check as parameters. The tricky part, I guess, is knowing what to pass down to the next call.
I don't think I can offer any more advice without at least seeing some table structures.
Sorry for answering so late, but the problem was of course that the recursion wasn't a viable solution since I had to search inside multiple tables. So I resolved by doing a simple 2-Level search in the tables that I needed.
Thank you very much for the help, and sorry again for answering so late.
This is what I have and below what I want to do. d. is a table, and act is a view that consists of about 50 combined tables:
SELECT d.extensionaspect1 AS "Exception ID",
d.causedat AS "Date",
max(act.date_) AS "Causedate",
act.prodsteppath AS "Production Step",
--I'm calling other selections on d, but i'm not going to incude
--them for the sake of clarity
FROM pasx.deviationevent d,
pasx.vtemp_prodsteppath act
--There's more here, but I'm not going to include them for the sake of clarity
WHERE act.date_ < d.causedat
--as before, there's a large amount of AND clauses here that make
--sure that I get the timestamps I want. This is a pretty complex query
GROUP BY d.causedat,
ORDER BY d.extensionaspect1;
Running like this gives me ORA-00936; missing expression. I'm very new at this, so I'm probably fundamentally misunderstanding how to use select max(act.date_) and use it to find the timestamp that occurred just before d.causedate. act.date_ contains all the possible timestamps that could lead to throwing an exception, but only the one before the timestamps in d.causedat are relevant to me.
vtemp_prodsteppath is a view and contains no order or group by's. How do I join these two tables (d and act) together? What expression am I missing?
I'm trying to build a report in AX 2009 (SP1, currently rollup 6) with a primary data source of the SalesQuotationLine table. Due to how our inventory is structured, I need to apply a filter that shows only certain categories of items (in this case, non-service items as defined in the InventTable). However, it seems that there is a problem in the link between the SalesQuotationLine and InventTable such that only two specific items will ever display.
We have tested this against the Sales Quotation Details screen as well, with the same results. Executing a query such as this:
...will only show quotes that have one of the specific items mentioned earlier. If we change the Item Type to something else (for example to Item), the result is an empty set. We are also getting this issue on one of our secondary test servers, which for all intents is a fresh install.
There doesn't seem to be any issues with the data mapping from the one table to the other, and we are not experiencing this issue with any other table set. Is this a real issue, or am I just missing something?
After analyzing the results from a SQL Profile run during the execution of the query, it seems the issue was a system bug. When selecting a table to join to the SalesQuotationLines, you have two options: 'Items' and 'Items (Item Number)'. Regardless of which table you select the query executes with, it joins the InventTable with the relation "SalesQuotationLines.ProjTransCode = InventTable.ItemId".
After comparing the table to other layers in the system, I found the following block of code removed from the createLine method (in the SYP layer):
if (this.ProjTransType == QuotationProjTransType::Item)
{
this.ProjTransCode = this.ItemId;
}
Since the ProjTransCode is no longer being populated, the join does not work except on certain quote lines that do have the ProjTransCode populated.
In addition, there is no directly defined relation to the InventTable - the link is only maintained via an Extended Data Type that is used on the SalesQuotationLine.ItemId field. Adding this relation in manually solved the problem.
I am writing a simple program to insert rows into a table.But when i started writing the program i got a doubt. In my program i will get duplicate input some times. That time i have to notify the user that this already exists.
Which of the Following Approaches is good to Use to achieve this
Directly Perform Insert statement will get the primary key violation error if it is duplicate notify otherwise it will be inserted. One Query to Perform
First make a search for the primary key values. If found a Value Prompt User. Otherwise perform insert operation.For a non-duplicate row this approach takes 2 queries.
Please let me know trade-offs between these approaches. Which one is best to follow ?
Regards,
Sunny.
I would choose the 2nd approach.
The first one would cause an exception to be thrown which is known to be very expensive...
The 2nd approach would use a SELECT count(*) FROM mytable WHERE key = userinput which will be very fast and the INSERT statement for which you can use the same DB connection object (assuming OO ;) ).
Using prepared statements will pre-optimize the queries and I think that will make the 2nd approach much better and mre flexible than the first one.
EDIT: depending on your DBMS you can also use a if not exists clause
EDIT2: I think Java would throw a SQLExcpetion no matter what went wrong, i.e. using the 1st approach you wouldn't be able to differ between a duplicate entry or an unavailable database without having to parse the error message - which is again a point for using SELECT+INSERT (or if not exists)