I wrote this query to show me the last purchase of each customers using "EXISTS" but it is not working. it returns all of the rows without filtering them. Can you please advise me how to resolve this issue? Thank…
I have a MYSQL database with a table 'product', about 500 000 rows, with a column 'oem' (varchar 255, utf8_unicode_ci). I have another table 'oem' with a column 'oem' too (varchar 255, utf8_unicode_ci), about 150 000 rows. I need to…
I'm trying to make a query in my PostgreSQL database that checks whether an optional string value exists or not. How do I do that, taking into account my database always fill out the full size of the column with…
I have to write a query which will return the latest timestamp column's value from a table if rows exist. If there is no row(s) in table then it return the default value. I have write the following query in…
For example use Test table with only positive id value. Query select 1 from public.Test where id = 0 return empty result. But when I use this query: select case when exists(select 1 from public.Test where id = 0) then…
I am new to SQL and having a hard time to filter out a table using SQL query. I have a table as below CATEGORY | NAME | UID | LOCATION ------------------------------------------------------------------------ Planning | Test007 | AVnNDZEGp5JaMD | USER Planning…