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SQL convert columns in rows
I want convert this table (Reading): ID TimeTable_ID reading_Value Sensor_ID 1 1 482 1 2 1 153 2 3 1 152 …
Fetch most recent value – sql execution time too long
I have a Firebird database with a table with two columns: Date and value. I want to get the most recent value. Problem is, that this table can have easily over 200k rows. My select query takes more than 400ms, which is just to long for my application. Is there any way, I can speed this up? I can’t chang…
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How can json_extract be used to look through all objects in an array? It works if you knew the key, but I want to look at every single object and find the one that matches. How to get this to work? Answer You have this flagged with MySQL and Sqlite, so I’m going to flip a coin and give a
SQL Update One Table If Record Does Not Exist In Another Table
The above works to give me all the customer accounts that have no invoices. It takes a long time to run, but I’m not concerned with the speed. I will likely only run this a couple times a year. What I can’t get right is updating a record in the customers table when the account has no invoices. I h…
Calculate time difference between two columns of string type in hive without changing the data type string
I am trying to calculate the time difference between two columns of a row which are of string data type. If the time difference between them is less than 2 hours then select the first column of that row else if the time difference is greater than 2 hours then select the second column of that row. It can be
How to populate dictionary using SQL table data
In my C# project, I have a dictionary, its values are currently static. Now I need to set to its values in dynamically. how can I do that? I have an Oracle DB table called “country” there have two columns called, ID and CountryName as follows, How can I set this table values to my dictionary? Than…
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I have a string and I need to return the characters between the double quotes ‘((“Name 1” and “Name 2”) or “Name 3”) I need to return I have used the function below to split the string but I am getting the (( and the Or and AND etc .. which I don’t want and unfo…
Golang db query using slice IN clause
Can someone explain to me why this does not work? And this does I’m trying to do a simple IN clause with a slice of ints, and every solution suggested doesn’t seem very idiomatic Tried to do this, but the problem appears to be the string substitution. I’m a bit surprised that go doesn’…