How do I select the first row in SQL?

4 Ways to Join Only The First Row in SQL

Use Correlated Subqueries when the foreign key is indexed.
Use a Complete Subquery when you don’t have indexes.
Use Nested Subqueries if you have an ordered ID column.
Use Nested Subqueries if you have an ordered ID column.
Use Window Functions if you need more control.

Which method returns the first column of the first row of data returned by an SQL query?

ExecuteScalar Method
MySqlCommand. ExecuteScalar Method. Executes the query, and returns the first column of the first row in the result set returned by the query.

How do you join based on conditions in SQL?

A conditional column join is a fancy way to let us join to a single column and to two (or more) columns in a single query. We can accomplish this by using a case statement in the on clause of our join. A case statement allows us to test multiple conditions (like an if/else if/else) to produce a single value.

How do I find top 5 rows in SQL?

SQL SELECT TOP Clause

SQL Server / MS Access Syntax. SELECT TOP number|percent column_name(s) FROM table_name;
MySQL Syntax. SELECT column_name(s) FROM table_name. LIMIT number;
Example. SELECT * FROM Persons. LIMIT 5;
Oracle Syntax. SELECT column_name(s) FROM table_name. WHERE ROWNUM <= number;
Example. SELECT * FROM Persons.

What is the return type of ExecuteScalar () method?

ExecuteScalar() is used to retrieve a single value from database, so return type of ExecuteScalar is Object.

How do I get the first 5 rows in SQL?

How can I get top 5 salary in SQL?

Solution 13

SELECT MAX(salary) FROM employee;
SELECT MAX(slary), dept_id from employee group by dept_id;
select distinct salary from employee order by salary desc limit 5;
select distinct salary, dept_id from employee order by salary desc limit 5;

How to select first row from join that?

I have two tables that I am joining. They share a key. The person table has one name per primary key but the email table has multiple emails per personId. I want to only show the first email per person.

How does min work in MySQL left join only first row?

the condition that connects t1 and t2 is moved from the ON and into the inner query WHERE. the MIN (primary key) or LIMIT 1 makes sure that only 1 row is returned by the inner query. after selecting one specific row we need to tell the ON which row it is. that’s why the ON is comparing the primary key of the joined tabled.

How to select first row from return multple?

They share a key. The person table has one name per primary key but the email table has multiple emails per personId. I want to only show the first email per person. Presently I get multiple rows per person because they have multiple emails. I am running SQL-Server 2005.

How to select only first rows that satisfies conditions?

(You can look at rank and dense_rank for alternative methods to pick the ‘first’ row). The outer query just restricts the result set to those where the extra column has the value 1, which will give you one row for every p.id.

How do I select the first row in SQL?