I’m trying to find out how to use ANALYZE EXPLAIN on my PSQL query. If I add ANALYZE EXPLAIN SELECT, I get a syntax error. I have no clue how to use it. I added the ANALYZE before the first and second SELECT, but both throw a syntax error. I was unable to find different examples but on documentation, I
Tag: sql
Get distinct sets of rows for an INSERT executed in concurrent transactions
I am implementing a simple pessimistic locking mechanism using Postgres as a medium. The goal is that multiple instances of an application can simultaneously acquire locks on distinct sets of users. The app instances are not trying to lock specific users. Instead they will take any user locks they can get. Sa…
Data Model for multiple checkboxes
I currently have a supplier table and now I want to store the regions served by each supplier. As a first thought, I made my supplier model like this : Does this seem to be a good pattern? Especially for queries to filter suppliers by region served etc. Is this solution still reliable if in the future I want …
translate query from Oracle to Postgres
I need to translate this query from Oracle to Postgres: can someone help me? thanks in advance for your attention and support Answer In postgres the operateur ~ performs a regex comparison as thus replaces the Oracle function regexp_like(). Your query therefore becomes. I would like to alert your attention th…
Build efficient SQL statements with multiple parameters in C#
I have a list of items with different ids which represent a SQL table’s PK values. Is there any way to build an efficient and safe statement? Since now I’ve always prepared a string representing the statement and build it as I traversed the list via a foreach loop. Here’s an example of what …
Increment column value based on condition
I’d like to increment the values in the column nc by 1 each time the value in 10minDiff changes. In the Table below, the values in nc should read 2 from row 1246 onwards and 3 the next time 10minDiff changes from 10. Answer Since data is not textual.I am writing UnTested query.
How to use get value from multiple tables using left join?
I have these 3 Tables. Now I need to show the timezone name from the timezone table in the Devices Table by using left join. How can i do that? Please Help Table Name : [pbi].[GEOTAB_INFO_GROUPS] Table Name : [adl].[GEOTAB_VEHICLE_INFO_DEVICES] Table Name : [pbi].[Location_Time_Zone] I Am trying like this but…
Trigger causing Maximum trigger nesting level exceeded
I have created a new trigger that updates my [Purchase Table] if the number of delivered items equals the ordered quantity, but every time it’s run I get the following error. ODBC–update on a linked table ‘dbo_Purchase Table’ failed. Maximum stored procedure, function, trigger or view …
Is there a way to terminate the insert query in a trigger?
I wonder is it able to terminate or stop the Insert if it hits the exceptions. The trigger coding will be: Answer This is how I understood it; though, it is not clear what UPDATE TABLE in your code represents. Update which table? How? With which values? Anyway: sample data: Trigger: Testing:
get rows that have the same value column
I’m trying to select rows that have the same column values using BigQuery on Githubs public data. I’d approach it like so using SQL server but I am getting “Correlated subqueries that reference other tables are not supported unless they can be de-correlated, such as by transforming them into…