I was this was a complicated question....but unfortunately it seems to be very simple, just with the nuance of a FileMaker Pro (v12) database. I am trying to query an order table and get a count per hour....but I just get an error stating my code is wrong....but I cant see why...
SELECT
,count(distinct "order_no") as requisition_cnt
,hour("z_time")-2 as date_hr
,day("z_date") as date_day
,month("z_date") as date_month
,year("z_date") as date_year
,"z_date" AS date_full
FROM "P__Lähete"
where
year("z_date") = 2021
group by
hour("z_time")-2
,day("z_date")
,month("z_date")
,year("z_date")
,"z_date"
order by
"z_date",hour("z_time")-2
Related
I am having an issue with a date literal not returning any results when I run an SOQL query. The query is as follows:
Select * From dbo.Case WHERE CreatedDate = YESTERDAY
With the query, I would like to obtain case data from the previous day. I know there is data available that was created the previous day. The results of the query when I preview it, though, are an empty set with no error message.
A different wrinkle that makes this not quite a strict SOQL issue is that I am trying to use this query as an SQL command on an ADO.NET connection using the CData ADO.NET driver to connect to a SalesForce.com instance. My goal is to be able to build SSDT packages that will allow me to stage the data from SalesForce into our SQL Server for processing there.
I have similar issues using the LAST_N_DAYS date literal as well.
I believe I should be using SOQL to query in the SQL command text field for the ADO.NET source connection but I am not 100% sure about that. I know for certain that I cannot use T-SQL because it does not recognize the GETDATE().
Any guidance on how to pull the records from Case for the previous day or where the query I am using might be wrong would be greatly appreciated.
Found an answer. The following SQL command will pull the data from the previous day:
Select * From dbo.Case Where CreatedDate = 'YESTERDAY'
The single quotes evaluate the yesterday date literal as expected.
Likewise, the following SQL statement will get the last 30 days of data.
Select * From dbo.Case Where CreatedDate = 'LAST_N_DAYS:30'
Thanks to anyone who researched and attempted the question! :)
I am running a db2 query that unions two very large tables. I started the query 10 hours ago, and it doesn't seem to finish yet.
However, when I check the status of the process by using top, it shows the status is 'S'. Does this mean that my query stopped running? But I couldn't find any error message.
How can I check what is happening to the query?
In DB2 for LUW 11.1 there is a text-based dsmtop utility that allows you to monitor the DB2 instance, down to individual executing statements, in real time. It's pre-11.1 equivalent is called db2top.
There is also a Web-based application, IBM Data Server Manager, which has a free edition with basic monitoring features.
Finally, you can query one of the supplied SQL monitor interfaces, for example, the SYSIBMADM.MON_CURRENT_SQL view:
SELECT session_auth_id,
application_handle,
elapsed_time_sec,
activity_state,
rows_read,
SUBSTR(stmt_text,1,200)
FROM sysibmadm.mon_current_sql
ORDER BY elapsed_time_sec DESC
FETCH FIRST 5 ROWS ONLY
You can try this command as well
db2 "SELECT agent_id,
Substr(appl_name, 1, 20) AS APPLNAME,
elapsed_time_min,
Substr(authid, 1, 10) AS AUTH_ID,
agent_id,
appl_status,
Substr(stmt_text, 1, 30) AS STATEMENT
FROM sysibmadm.long_running_sql
WHERE elapsed_time_min > 0
ORDER BY elapsed_time_min desc
FETCH first 5 ROWS only"
Note that PostgreSQL website mentions that it has a limit on number of columns between 250-1600 columns depending on column types.
Scenario:
Say I have data in 17 tables each table having around 100 columns. All are joinable through primary keys. Would it be okay if I select all these columns in a single select statement? The query would be pretty complex but can be programmatically generated. The reason for doing this is to get denormalised data to populate a web page. Please do not ask why though :)
Quite obviously if I do create table table1 as (<the complex select statement>), I will be hitting the limit mentioned in the website. But do simple queries also face the same restriction?
I could probably find this out by doing the exercise myself. In the next few days I probably will. However, if someone has an idea about this and the problems I might face by doing a single query, please share the knowledge.
I can't find definitive documentation to back this up, but I have
received the following error using JDBC on Postgresql 9.1 before.
org.postgresql.util.PSQLException: ERROR: target lists can have at most 1664 entries
As I say though, I can't find the documentation for that so it may
vary by release.
I've found the confirmation. The maximum is 1664.
This is one of the metrics that is available for confirmation in the INFORMATION_SCHEMA.SQL_SIZING table.
SELECT * FROM INFORMATION_SCHEMA.SQL_SIZING
WHERE SIZING_NAME = 'MAXIMUM COLUMNS IN SELECT';
I have an ADO query that I use to gather data and later use to update that data. (Embarcadaro C++ Xe2 & Oracle 10g). Rownum (aliased to pgnum) is also selected and in this query. When posting data edited via this query, I receive invalid identifier "pgnum". This seems to be an issue specifically with ADO as this same code worked in previous versions of our software. We recently converted all our queries to ADO from Tquery (old BDE Driven). Adding "pgnum" to the queries persistent fields does not help. Any advice would be greatly appreciated.
Table1 is an ADOQuery.
sql = "SELECT ROWNUM PGNUM, A.* FROM DOCUMENT_IMAGE A WHERE DOCNO = " + String(Form1->qryDocumentDOCNO->AsInteger) + " ORDER BY ROWNUM ";
Table1->Close();
Table1->SQL->Clear();
Table1->SQL->Add(sql);
Table1->Open();
Table1->Edit();
Table1IMAGE->LoadFromFile(filepath);
if (Table1->Modified){
Table1->Post();
}
After tons of research and testing I could get nothing to work while keeping rownum in the query. I'm honestly not sure what it was accomplishing, I took this project over from someone else. Anyway, I removed rownum and used a different field to order the query by, problem solved.
I am working on a project where I came across on a sql query. I want see the execution flow fully. i.e how the query executed on database. what can I do for this?
can any body help me for this?
Atomic Operations
The query will be an atomic operation so that you could set table A.Description = table B.Description without having to worry about overwriting the data from either table.
A great book on sql querying -The book that you need to read is Inside Microsoft® SQL Server® 2008: T-SQL Querying. This will show you exactly how a query is processed. You can also use Display Estimated Execution Plan / Show Actual Execution Plan setting in sql server management studio to see a visual plan. You can right click the query pane to toggle them on and off. You will have to figure out how to read it first.
Actual Order of query based on Itzak Ben-Gan in the book.
1 FROM
2 ON <join_condition>
3 <join_type> JOIN <right_table>
4 WHERE <where_condition>
5 GROUP BY <group_by_list>
6 WITH { CUBE | ROLEUP }
7 HAVING <having_condition>
8 SELECT
9 DISTINCT
10 ORDER BY <order_by_list>
11 TOP