Let’s say I have two data sets A and B After left join I should get FALSE value for Y in table A as it doesn’t have it in table B Answer Using your approach, if you intend to get a value of FALSE if the value doesn’t exist you can check for NULL in the name. The example below
Difference between JOIN and Inner JOIN in Sybase
I have a query like below. I don’t understand the difference between join vs inner join used on the below code. Aren’t they the same? This is written for Sybase. Please help me know the difference. Answer According to the standard INNER JOIN=JOIN. I think, Sybase does not break this rule
Deduce End date from a list of StartDate
I have the following data table And I would like to add another column corresponding to the EndDate, with the EndDate of one ID being the StartDate of the next. So it means the following result: Activity ID StartDate EndDate A 1 10/02/2021 11/02/2021 A 2 11/02/2021 12/02/2021 A 3 12/02/2021 ?? B 1 08/02/2021 …
Are inner parenthesis needed in the WHERE clause? or anywhere
In the WHERE section or anywhere really where you have multiple conditions like OR’s I know outer parenthesis are required but are the inner ones? For example my assumption is that Is the same as writing However if we remove the outer parenthesis then I know the query will be different. Example: And Are…
datetime conversion failed when converting date or time from character string SQL (c#)
I am trying to get my program to work, it is using parameters in an SQL query to add it to the database. When I run the program it comes up with “datetime conversion failed when converting date or time from character string”. I have tried many types of coding to make it work and all have failed. T…
SQL how to fill out first line of group with value and other values to null
Actually i have a select statement which contains a group by I would like this : How to do that (test value fill in first row group) with sql (pgsql) ? thanks ! I tried Partition by… Answer demo:db<>fiddle Enumerate all records of an ordered group to find the first one using the row_number() windo…
Result of ‘File.createNewFile()’ is ignored
I’m not sure why this is but in my IDE, for file.createNewFile(); I’m getting Result of ‘File.createNewFile()’ is ignored for it which I’ve no idea what I should be doing Answer Static Code Inspection in your IDE for createNewFile might be complaining this because createNewFile r…
avg value from a sql table
I have a MySQL table called track_e_exercises where is stored attempts in a test, every row is a new attempt. I want to know how to obtain the avg attempts in the course per person. How can I make that? c_id is the course id column and exe_user_id is the user id column. expected result for c_id=7 => (# of
Is there a way to filter rows in BigQuery by the contents of an array?
I have data in a BigQuery table that looks like this: My question is, how can I find all rows where “key” = “a”, “value” = 1, but also “key” = “b” and “value” = 3? I’ve tried various forms of using UNNEST but I haven’t been ab…
Distincted ids for grouped values
I want to count the distinct ids in each numb and store them in a column : Tried this: Receive this output: As you can see COUNTER columns has the count of distincted ids but for all NUMB I want to output this: 1515 has 2 ids 1921 has 1 id 2121 has 2 ids I tried also to place