I have Teradata SQL query that will provide values for each day, I need to run this query for months. My organization doesn't allow me to use macros or procedures, is there any alternatives apart from these two things that will automate my SQL query in Teradata. Apologies I cannot display sample code in here
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I want a query to get the column relation or reference of column for the table or for all the databases.
Like in MySQL, we have a query
SELECT * FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE WHERE
TABLE_SCHEMA = 'database_name';
So, What is the query for Progress OpenEdge to get column relation.
Also where are procedure, functions and views stored in ProgressDB?
Query to view database name list?
To find relationships, or views, or stored procedures you must query the meta-schema. Stefan's link documents SYSTABLES, SYSCOLUMNS, SYSINDEXES, SYSPROCEDURES, and SYSVIEWS. These are the tables that define what you have asked for.
https://docs.progress.com/bundle/openedge-sql-reference-117/page/OpenEdge-SQL-System-Catalog-Tables.html
The Progress database does not explicitly store relationships. They are implied, by convention, when there are common field names between tables but this does not create any special relationship in the engine. You can parse the tables above and make some guesses but, ultimately, you probably need to refer to the documentation for the application that you are working with.
Most Progress databases were created to be used by Progress 4gl applications. SQL came later and is mostly used to support 3rd party reporting tools. As a result there are two personas - the 4gl and sql. They have have many common capabilities but there are some things that they do not share. Stored procedures are one such feature. You can create them on the sql side but the 4gl side of things does not know about them and and will not use them to enforce constraints or for any other purpose. Since, as I mentioned, most Progress databases are created to support a 4gl application, it is very unusual to have any sql stored procedures.
(To make matters even more complicated there is some old sql-89 syntax embedded within the 4gl engine. But this very old syntax is really just token sql support and is not available to non-4gl programs.)
We need to use GenerateTableFetch to fetch huge data from teradata using nifi. But since Teradata is not present as a database type it generate Limit keyword. I am able to replace it with Sample keyword. But sample everytime give random value so how can i use Nifi with Teradata for huge table?
Maybe try the "MS SQL 2008" adapter, it generates a TOP statement as well as a ROW_NUMBER() OVER clause. If that doesn't work, we'd need a TeradataDatabaseAdapter implementation, please feel free to file an improvement Jira as needed.
Suppose I've prepared some statements with sqlite3_prepare_v3, after that I've inserted large amounts of data into database and run ANALYZE. Do I need to create the statements anew after that so that the query planner uses updated statistics information gathered by ANALYZE?
The ANALYZE statement expires all prepared statements.
When you have used sqlite3_prepare_v2() or _v3(), the sqlite3_step() function will then automatically re-prepare the statement.
I have a handful of records, 5-10, that I need to take from the user and run a SQL merge statement against. I can think of three ways of accomplishing this.
.net Loop processing one record at a time - Wondering what the performance of this would be compared to the other options. I would think it is pretty good given connection pooling?
SQL Data Table type - I have seen these used elsewhere in the project, but as I learned first hand these are a pain to update the table definitions if need, dropping the entire object and recreating
XML variable - I have used this in the past. I like it because it is flexible to change the definition of the object. The .net is simple with XMLSerializer. But I am sure there is probably a performance hit to call XMLSerializer. And then on the SQL side to use the .nodes() function.
Does anyone know by personal experience or some reference, such as a white paper, which method is the most efficient when inserting/updating records in a database via .net application?
For 5-10 items you can use "clasic" insert with more records.
INSERT INTO MyTable
(ColumnA, ColumnB, ColumnC)
VALUES
(#ColumnA_0, #ColumnB_0, #ColumnC_0),
(#ColumnA_1, #ColumnB_1, #ColumnC_1),
(#ColumnA_2, #ColumnB_2, #ColumnC_2)
This is MUCH faster than XML or DataTable. And is faster than isolated inserts in loop.
The limit for number of inserted records is 1000. If you want more, you need execute more statements.
I'm in the process of developing an application that allows users to select tables and columns, and choose join methods ( like inner, outer..) as well as aggregate functions sql (sum, avg..etc) for the purpose of generating reports from those selections.
What I did is append strings to build a request to an sql server. I think i'm wrong doing it this way because users can choose a lot of columns and that throws unexpected exceptions. Are there some ideas on a better way to go about this (not source code)?
As you have asked, what is best way to manage query ( can contain sum,avg etc..) generated on server side and made those to execute on SQL server, I am writing best possible suggestion for this. Consider that and follow your path.
If you have adhoc queries generated in server side, then definitely you can write those into SQL group of statements known as Stored Procedure . And this has following advantages.
More manageable, if same set of SQL blocks need in multiple places, then use this single procedure everywhere.
Secure - you don't have to set permission( like select) for multiple tables (joining tables), instead just have execute permission for procedure.
Good Performance - Execution Plan Caching and Reuse
Source - http://weblogs.asp.net/fbouma/38178
Stored proc - http://msdn.microsoft.com/en-us/library/ms190782.aspx
If you are new to stored procedure and want to know, how to use that in asp.net, here is tutorial for this - http://www.dbtutorials.com/advanced/using-stored-procedures-cs/