Question: How do I select a set of rows in SQL?

To select rows using selection symbols for character or graphic data, use the LIKE keyword in a WHERE clause, and the underscore and percent sign as selection symbols. You can create multiple row conditions, and use the AND, OR, or IN keywords to connect the conditions.

How do I select a range of records in SQL?

Summary: in this tutorial, you will learn how to use SQL BETWEEN operator to select data within a range of values. The BETWEEN operator is used in the WHERE clause to select a value within a range of values. We often use the BETWEEN operator in the WHERE clause of the SELECT, UPDATE and DELETE statements.

How do I select the middle 10 rows in SQL?

Display Middle Record

  1. SELECT * FROM table_name WHERE ROWNUM <=
  2. (SELECT CASE MOD(COUNT(1),2)
  3. WHEN 0 THEN(COUNT(1)/2) + 1.
  4. ELSE ROUND(COUNT(1)/2) END FROM table_name)
  5. MINUS.
  6. SELECT * FROM table_name.
  7. WHERE ROWNUM < (SELECT (COUNT(1)/2) FROM table_name)
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How do I limit the number of rows in SQL?

If you don’t need to omit any rows, you can use SQL Server’s TOP clause to limit the rows returned. It is placed immediately after SELECT. The TOP keyword is followed by integer indicating the number of rows to return. In our example, we ordered by price and then limited the returned rows to 3.

How do I select the last 3 rows in SQL?

SELECT * FROM (select * from suppliers ORDER BY supplier_name DESC) suppliers2 WHERE rownum <= 3 ORDER BY rownum DESC; Notice that although you want the last 3 records sorted by supplier_name in ascending order, you actually sort the supplier_name in descending order in this solution.

What is offset in SQL query?

The OFFSET clause specifies the number of rows to skip before starting to return rows from the query. The offset_row_count can be a constant, variable, or parameter that is greater or equal to zero. The FETCH clause specifies the number of rows to return after the OFFSET clause has been processed.

What is Rownum in SQL?

For each row returned by a query, the ROWNUM pseudocolumn returns a number indicating the order in which Oracle selects the row from a table or set of joined rows. … If an ORDER BY clause follows ROWNUM in the same query, then the rows will be reordered by the ORDER BY clause.

How do I get Rownum in MySQL?

MySQL ROW_NUMBER() Using Session Variable

Execute the below statement that add the row number for each row, which starts from 1: SET @row_number = 0; SELECT Name, Product, Year, Country, (@row_number:=@row_number + 1) AS row_num.

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How do I find the middle element in SQL?

To get the median, we need to be able to accomplish the following:

  1. Sort the rows in order and find the rank for each row.
  2. Determine what is the “middle” rank. For example, if there are 9 rows, the middle rank would be 5.
  3. Obtain the value for the middle-ranked row.

How do I select the first 10 rows in SQL?

The ANSI SQL answer is FETCH FIRST . If you want ties to be included, do FETCH FIRST 10 ROWS WITH TIES instead. To skip a specified number of rows, use OFFSET , e.g. Will skip the first 20 rows, and then fetch 10 rows.

How do I select top 5 rows in SQL?

SQL SELECT TOP Clause

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

How do you use limits?

The Limit clause works with the SELECT statement for returning the specified number of rows only. This query accepts only one or two arguments, and their values should be zero or any positive integer.

The following are the syntax of using Limit query in MySQL:

  1. SELECT column_list.
  2. FROM table_name.
  3. LIMIT offset, count;

How do I get last 10 rows in SQL?

The following is the syntax to get the last 10 records from the table. Here, we have used LIMIT clause. SELECT * FROM ( SELECT * FROM yourTableName ORDER BY id DESC LIMIT 10 )Var1 ORDER BY id ASC; Let us now implement the above query.

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How do I count duplicate rows in SQL?

How to Find Duplicate Values in SQL

  1. Using the GROUP BY clause to group all rows by the target column(s) – i.e. the column(s) you want to check for duplicate values on.
  2. Using the COUNT function in the HAVING clause to check if any of the groups have more than 1 entry; those would be the duplicate values.

How do I get the last two rows in SQL?

To select last two rows, use ORDER BY DESC LIMIT 2.

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