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 MS-SQL which is working fine for me. But , now I need to write this query in MySQL. I have
Tag: exists
Generalized way to remove empty row given by aggregate functions
Example: The below query would give an empty NULL row when no data is present. The NULL row result looks like this: MaxNumber 1 NULL To detect if the query returns data or not I had to do this: Returns 1 if a max number exists and 0 if empty table. Is this how we generally tackle the empty row
Update query with join and where clause
I’m currently confused with a (fairly easy) update statement that I’m trying to execute on a table. The two tables are as such: Customer table has the columns Loan table has the columns I would like to update the passworddisabled attribute to true if they are registered via a specific cash registe…
SQL query for EXCEPT or NOT IN
I’m new to SQL and I am trying to write a query on PostgreSQL to find the cust_ID and customer name of each customer at the bank who only has a loan at the bank, and no account. The database schema is: The results should have only these 3 customers: My two attempts for this query are: 1) Where my
Need to Pick Max Date when status = N otherwise No in MYSQL
I have a table which have records like this I’m trying to get the Max Date for each ID which have STATUS = ‘N’. If I get MAX DATE and STATUS = ‘C’ then I don’t want that record. Output : SCRIPT : But I’m not able to get desired output. Answer You can use NOT EXISTS: I…
Remove subset rows of other rows in SQL
I’ve this table below that includes ID, and five indicator columns: x1, …, x5: I need to remove duplicates based on this logic: For each ID, we look at the values of x1, …, x5, and we remove the ones that are subset of other row. For example, for ID=1, row #3 is a subset of row #2, so we
Changing In to Exists in SQL – with DISTINCT
Having this one: Reading this one: Changing IN to EXISTS in SQL Tried to change it into “Exists”, but produced this and it did not work: The error is 3706: Syntax error: expected something between ‘=’ and ‘DISTINCT’ keyword. Answer You have already redundant code. Inside th…
Update to replace specific value with another except when it already exists
I have a table with values like this: There’s also a UNIQUE constraint on both columns I want to change all ‘poo’ to ‘woo’, as long as it doesn’t violate the constraint, and then delete the remaining ‘poo’, in order to obtain this table: My attempts to far for t…
How to select rows where multiple values do not exist
Scenario: Charlie, Amy and Robert have each filled out a survey which asks the user to select all the sports they are interested in. The question is multiple choice. In the table surveyData each row represents one of the answers each user chose. so Charlie(0001) chose basketball, rugby, acrobatics and darts. …
Filtering with exists in BigQuery
I’m running the following query in bigQuery and I don’t have the expected output. Isn’t that only the row with Alpha should be returned? Answer Use below instead with output