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#SQL

13

SQL is a standard language for storing, manipulating and retrieving data in relational databases.

All time

hi,

i have two where-clauses:

a) ... WHERE company=1 and product=7

b) ... WHERE product=7 and company=1

with other words the position of the where fields are swapped.

now the question is:

bring the where clauses a) and b) the same performance(queryplan) or do i have to write it in a special order???

in my point of view, there is a parser/optimizer who cares about this, so i don't have to care about.

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I have the following query which tells me how many documents were retrieved for each customer, but it only works for the "on-demand" customers:

SELECT PatientFacility, LEFT(LocalDateTime,7) as Mnth, Count(*)
FROM HS_IHE_ATNA_Repository.Aggregation
WHERE EventType IN ('RecordRequest','RecordRequestBreakGlass')
AND LocalDateTime >= '2016-01-01'
AND LocalDateTime < '2017-01-01'
GROUP BY PatientFacility, LEFT(LocalDateTime,7)
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Hi

I have two tables: one a local table using cache and the other is via an SQL gateway connection to an MSSQL Server via a 64bit ODBC driver (ODBC Driver 17 for SQL Server).

When I try to join them on a date field I don't get any matches, and I know that there are matches, e.g. running both views separately returns resuls for 30/11/2022.

The following statement returns rows for the first table r, but nothing for the table l

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Hi Community,

Please welcome the new video on InterSystems Developers YouTube:

⏯ Getting Started with IntegratedML

https://www.youtube.com/embed/f7A-wbNkIic
[This is an embedded link, but you cannot view embedded content directly on the site because you have declined the cookies necessary to access it. To view embedded content, you would need to accept all cookies in your Cookies Settings]

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Attached to this post is a PDF document outlining some of the key enhancements included with 2016.2. I will be giving a WebEx session that is open to all tomorrow at 11 AM EST. Once the WebEx is over I will be adding a link to the recording for those who cannot attend.

2016.2 Field Test Launch
Tuesday, February 2, 2016
11:00 am | Eastern Standard Time (New York, GMT-05:00) | 30 mins

Meeting number: 747 673 229

Join!

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Hello Team,

I need a help in the following error I am getting while running the SQL Query. I am running the SQL Query from different table using inner join. I run this everyday for last 90 days but for few days while extracting the data through this query I am getting this error. Please assist.

SQLException was thrown: Incorrect list format: 0 >= 0_SQLSTATE: S1000

SQLException was thrown: Incorrect list format: 0 >= 0_SQLSTATE: S1000

Error getting attributeColumn: Name

Error getting attributeColumn: Amount

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Hi,

We’re launching an Early Access Program for an upcoming Table Partitioning feature that will help IRIS customers manage very large tables, and distribute row data and associated indices across databases and storage tiers. Table Partitioning cuts deep into the core of IRIS relational data management, so we want to make sure we get things right through working with a few engaged customers who can provide feedback on the initial deliverables, and fine-tune as needed.

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Presenter: Anton Umnikov
Task: Identify your slowest SQL queries and tune them for better performance
Approach: Use InterSystems’ query profiling and analysis tools. Discuss how system configuration can affect performance

This session will show you how you identify the weakest link in your application SQL and introduce you to the fine art of tuning those queries. To do this we will take a look at InterSystems query profiling and analysis tools, as well as how system configuration can impact SQL performance.

Problem: Obscurity on how our SQL engine works

Content related to this session, including slides, video and additional learning content can be found here.

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Hi all,

I'm trying to use LOAD DATA to insert 11k (11,377) rows of data. LOAD BULK DATA is not available for the version of IRIS I am using.

After calling LOAD DATA it says only 5,500 rows has been inserted. The LOAD DATA docs says any error rows are skipped and a count of skipped rows can be found in %SQL_Diag.Result however there are no results here. There are no errors in the xDBC error log either.

Why have over half the rows been skipped?

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Question
· Mar 15, 2022
How to use LOAD DATA

How do I use the LOAD DATA command as described here.

I have the following LOAD DATA statement:

LOAD DATA FROM FILE 'E://Temp/Values.txt'

into PARIS.UAGU_MNDOOUT1 (AHSU_ID, AHSU_UAG_ID)

Where do I run it? It doesn't work in the SQL Gateway, in the terminal, in an embedded SQL command.

What am I missing?

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Is there a way to lock at the record level? I know that you can lock at the table level:

&sql(UNLOCK mytest IN EXCLUSIVE MODE)

but am unable to find a way to lock just at the record/row level.

Would this also affect a SELECT statement done on the record?

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Hello, we have a few hundreds of triggers to port from Oracle to Cachè for a migration project, and many of them have to change (for example, normalize a value, null it, etc) the value which is being inserted.

The documentation says "You cannot set {fieldname*N} in trigger code." , so we're unlucky.

Is there a good workaround for this ?

SqlComputeOnChange doesn't seem the best way, but I'm not totally sure: for example normalization and validation could have a better place somewhere else than a trigger.

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How do I write DDL script for collection properties?

For example I want to create the following class:

Class SQLUser.Person {

Property Name As %String;

Property FavoriteColors As list Of %String;

}

My DDL script looks like this:

CREATE TABLE Person (Name varchar(50), FavoriteColors ???)
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Hello,

I have established an ODBC connection with our client based on credentials they provided. The test connection was successful and after using the Link Table wizard I can now see the client's tables and properties. However when we try to execute a query in IRIS we are getting error code -226. I'm trying to determine if this could be just a simple setting problem in IRIS or something with the client.

We have tried with PostgreSQL as well as with TSQL. Same result for each.

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Question
· Jun 8, 2017
SQL Connect

How to simply going to get the value of the system language from ^%z? Because I got a problem, U2 context isn't setup while connecting the SQL Connect.

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Article
· Jan 28, 2022 2m read
Embedded SQL Bug and Workaround

We recently encountered an Embedded SQL issue while upgrading to IRIS 2021.1, and thought the issue and workaround might be interesting to share.

Key takeaway: Host variables in an ORDER BY clause of an embedded SQL query that is inside of a method don't work as expected. IRIS versions starting with 2020.1 are affected. As a workaround, add the host variable to the Method's PublicList list and "new" them so the embedded query has access to them.

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I need to execute multiple DELETE statements in a single query like this

DELETE FROM TableName WHERE ID = 2;
DELETE FROM TableName WHERE ID = 3;
DELETE FROM TableName WHERE ID = 4;

However It does not work when there're more than 2 statements and gives me an error

Expected FROM found WHERE^DELETE FROM TableName WHERE

Using IN is not an option.

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Hello there,

I have some problem with inserting date to table using dynamic sql.

I have Country class. This table has relationship with class Continent as parent and child. In addition I have another statistic class where property Country has type of Country class. I get ID such as "1||1" next I execute dynamic sql INSERT INTO Stats(Country) VALUES("_CountryId_"). Then I select Stats table and see that value of Country column is "11") As a result a can't get Country object.

Please advice solution of this problem

Thank you

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I am trying to migrate our SQL Connections from HealthShare Health Connect 2018.1.3 to IRIS HealthShare Health Connect 2022.2 using the Data Export/Import Wizard through the Management Portal. I am able to export the data fine, but I am running into issues trying to Import it into 2022.2 using the Data Import Wizard. When I run through the steps it is not importing everything from the txt file I created from 2018.1.3. I would rather not have to rekey all the connections if possible.

Here is the Background Task Error Log

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Article
· Sep 26, 2023 1m read
Create JSON Objects and Arrays by SQL

The related package avoids adding %JSONAdaptor to each class but uses instead
SQL functions JSON_OBJECT() to create my JSON objects. With this approach, you can
add JSON to any class - even deployed ones - without any need for change or recompiling.

The trigger was the Export of M:N relationships as JSON objects or arrays.

Open Exchange app
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Hi,

Is there a way to find the median in Intersystems Cache SQL? I know it is not available as an aggregate function. Also in SQL Server I could try something like: 

SELECT
(
 (SELECT MAX(Score) FROM
   (SELECT TOP 50 PERCENT Score FROM Posts ORDER BY Score) AS BottomHalf)
 +
 (SELECT MIN(Score) FROM
   (SELECT TOP 50 PERCENT Score FROM Posts ORDER BY Score DESC) AS TopHalf)
) / 2 AS Median

However, there is no PERCENT Keyword in Cache as well. Any suggestions?

Thanks

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