Table of Contents
- 1 How do you find your highest grade?
- 2 How do I find the highest 3 values in SQL?
- 3 What is distinct in SQL query?
- 4 How do I count different columns on the same table?
- 5 How do I select top 10 distinct rows in SQL?
- 6 Can you use distinct twice in SQL?
- 7 Can distinct command be used for more than one column True or false?
How do you find your highest grade?
The grade letters are ascending, but the “highest” or best grade is actually the lowest alphabetically. If the grade were a number instead of a letter, then we would use MAX(Grade) to get the highest grade number.
How do you find the highest value in SQL?
To find the max value of a column, use the MAX() aggregate function; it takes as its argument the name of the column for which you want to find the maximum value. If you have not specified any other columns in the SELECT clause, the maximum will be calculated for all records in the table.
How do I find the highest 3 values in SQL?
Query : select * from( select ename, sal, dense_rank() over(order by sal desc)r from Employee) where r=&n To find to the 2nd highest sal set n = 2 To find 3rd highest sal set n = 3 and so on.
How do I select maximum rows in SQL?
rev = ( SELECT MAX(rev) FROM Table1 t3 WHERE t3.id = t1.id ) GROUP BY t1.id;
- SELECT DISTINCT Table1.id, max(Table1. rev), max(Table2.
- FROM Employee : Table searched on.
- JOIN Table1 AS Table2 ON Table2. rev = Table1.
- GROUP BY Table1.id : Force the top-sorted, Salary row of each employee to be the returned result.
What is distinct in SQL query?
SQL DISTINCT clause is used to remove the duplicates columns from the result set. The distinct keyword is used with select keyword in conjunction. It is helpful when we avoid duplicate values present in the specific columns/tables. The unique values are fetched when we use the distinct keyword.
Can we apply distinct two columns?
Yes, the DISTINCT clause can be applied to any valid SELECT query. It is important to note that DISTINCT will filter out all rows that are not unique in terms of all selected columns.
How do I count different columns on the same table?
SELECT CompanyName, TotalOpenClaims = COUNT(CASE WHEN StatusID = 1 THEN ClaimID END), TotalClosedClaims = COUNT(CASE WHEN StatusID = 2 THEN ClaimID END), TotalReOpenedClaims = COUNT(CASE WHEN StatusID = 3 THEN ClaimID END), TotalPendingClaims = COUNT(CASE WHEN StatusID = 4 THEN ClaimID END) FROM dbo.
Does distinct have to be first?
Because the DISTINCT keyword applies to the entire result set, and not just one column, the DISTINCT must go at the start of the query, just after SELECT: SELECT DISTINCT col1, col2, col3 FROM table…
How do I select top 10 distinct rows in SQL?
You can also confirm this by showing the query plan. To do so, select Query -> Include Actual Query Plan from the menu before executing the query. The “Stream Aggregate” icon is for the DISTINCT operation and “Top” for the TOP 10 one.
Can we use distinct and order by together?
There is no way this query can be executed reasonably. Either DISTINCT doesn’t work (because the added extended sort key column changes its semantics), or ORDER BY doesn’t work (because after DISTINCT we can no longer access the extended sort key column).
Can you use distinct twice in SQL?
would give you distinct combinations of the two. No you can’t use that, it will throw an error, but there are other alternatives where you can get your desired results.
How can I get distinct count of multiple columns in SQL?
SQL databases can work with tuples like values so you can just do: SELECT COUNT(DISTINCT (DocumentId, DocumentSessionId)) FROM DocumentOutputItems; If your database doesn’t support this, it can be simulated as per @oncel-umut-turer’s suggestion of CHECKSUM or other scalar function providing good uniqueness e.g. COUNT( …
Can distinct command be used for more than one column True or false?
MySQL DISTINCT with multiple columns You can use the DISTINCT clause with more than one column. In this case, MySQL uses the combination of values in these columns to determine the uniqueness of the row in the result set.
How do I select a record without duplicates in one column in SQL?
SQL SELECT DISTINCT Statement SELECT DISTINCT returns only distinct (i.e. different) values. The DISTINCT keyword eliminates duplicate records from the results. DISTINCT can be used with aggregates: COUNT, AVG, MAX, etc. It operates on a single column.