I am looking for a way to count the number of columns in a table in Hive. I know the following code works in Microsoft SQL Server. Is there a Hive equivalent? SELECT COUNT(*), FROM …
Tag: distinct
SELECT DISTINCT values and INSERT INTO table
I want to take a column with values that repeat multiple times and get that value only once and store it for later use, but at the same time I would like to get another value in the same row as that distinct column. A, B, C represent three columns. Ignore C for now. My question is: How can I
sql query distinct with Row_Number
I am fighting with the distinct keyword in sql. I just want to display all row numbers of unique (distinct) values in a column & so I tried: however the below code giving me the distinct values: but when tried it with Row_Number. then it is not working. Answer Use this: and put the “output” of a query as the
GROUP BY and COUNT in PostgreSQL
The query: Returns n records in Postgresql: I just want to retrieve the number of records returned: 6. I used a subquery to achieve what I want, but this doesn’t seem optimum: How would I get the number of records in this context right in PostgreSQL? Answer I think you just need COUNT(DISTINCT post_id) FROM votes. See “4.2.7. Aggregate Expressions”
SQL query to find distinct values in two tables?
I would like to find the distinct Code values and get a return like this: I can’t figure out how to write a SQL query that would return me the above results. Anyone have any experience with a query like this or similar? Answer In proper RDBMS: In MySQL… the UNION removes duplicates
How can I SELECT rows with MAX(Column value), PARTITION by another column in MYSQL?
I have a table of player performance: What query will return the rows for each distinct home holding its maximum value of datetime? In other words, how can I filter by the maximum datetime (grouped by home) and still include other non-grouped, non-aggregate columns (such as player) in the result? For this sample data: the result should be: id home