I have a table with the following data And I would like to have for each ID how many occurrences of each type there are Is there a way in SQL (something like a pivot table) Answer I would recommend conditional aggregation. This is a cross-database solution that is more flexible than vendor-specific solutions (and at least as efficient):
Tag: select
How do I do this without a subquery?
I need to make the same query, but without a subquery! I need to get the count of rows in which genre_id is equal to the :deletedGenreId and the org_type_id value of this line in this table is not unique Answer There is nothing wrong with sub-query. Sub-query actually can help boost performance and increase code readability if you do
Check if multiple records exist, with the same id
I am trying to check if multiple records exists with pageId IN(?,?,?) in the chatParticipants table. This is an example of the table structure: This is the SQL query I have tried: Expected behavior: If a conversation already exists, with the given (x) participants, that is, with the same chatId value, then it must return the chatId value. The above
SQL Select – Get a count of data as a separate column error
I am working on this query whereas I have a table as follows Code | Date ————- 001 | 20-JUN 001 | 20-JUN 002 | 20-JUN 003 | 20-JUN 002 | 20-JUN 001 | 20-JUN 002 | …
Compute 2 Columns from current row and from the row above
I have a table that looks like this My target is to look like this Basically what it did is to sum all the way down based on stock in and stock out from beginning balance however I cant achieve it. …
Get direct hierarchy in SQL without siblings of searched id
I have a pretty simple table called Types which contians ID, ParentID and Name. What I need is to get the full hierarchy from an ID, but without including the siblings of the searched ID. I have written the following SQL, which gives me the full hierarchy of the table (with the topmost parent being id ‘246’): So far, so
Split multi-month records into individual months
I have data in a table in this format – where date range is multi-month: I want to create a view/ insert into a new table – the above record broken by month as shown below: Please advise. Answer Just another option using a CROSS APPLY and an ad-hoc tally table Example Returns
MYSQL Specific Order With Conditionals
Okay… I have three columns that I’d like to order based on their conditions. Column 1 (INT) = last_reboot Column 2 (BOOL) = onlinecheck Column 3 (INT) = drive_use I’d like “last_reboot” to be default and ordered descending. If “onlinecheck” = 0, I’d like it to be at the top of my query else ordered by the the “last_reboot” desc.
PostgreSQL ltree find all child node of a given path (With out using expression)
Only child node of given path (Except the given path) Query: select path from tree where path <@ 'a.b.c'; Result: Expected result: All the below node of a.b.c (In result don't needed a.b.c)
Skip rows if subquery returns multiple rows in Postgres
I want to update table prod_replay_out based on subquery results in Postgres. However, subquery returns multiple rows but I want to skip those rows and update table based on single rows return by subquery. I have referred link Subquery returns more than 1 row error but max() function will not apply for my expected results. Could you please provide me