- How do I find top 10 records in SQL?
- How do I get random records in SQL?
- How do I fetch a middle row in SQL?
- How do you check if a table exists in SQL?
- How do you find top 5 salary in SQL?
- How do I get the first 10 records in SQL?
- How do I find the specific number of rows in SQL?
- How do I get last 10 rows in SQL?
- Is Newid random?
- How do I select random rows in postgresql?
- How do I get bottom 10 records in SQL?
- How do I skip the first 10 rows in SQL?
- Does not exist SQL query?
- How do I find an existing record in SQL?
- What is offset in SQL query?
- Can we use offset without order by?
- How do I select duplicate rows in SQL?
- What is pivoting in SQL?
How do I find top 10 records in SQL?
The SQL SELECT TOP ClauseSQL Server / MS Access Syntax: SELECT TOP number|percent column_name(s) FROM table_name.
WHERE condition;MySQL Syntax: SELECT column_name(s) FROM table_name.
LIMIT number;Oracle Syntax: SELECT column_name(s) FROM table_name.
WHERE ROWNUM <= number;.
How do I get random records in SQL?
MySQL select random records using ORDER BY RAND()The function RAND() generates a random value for each row in the table.The ORDER BY clause sorts all rows in the table by the random number generated by the RAND() function.The LIMIT clause picks the first row in the result set sorted randomly.
How do I fetch a middle row in SQL?
Display Middle RecordSELECT * FROM table_name WHERE ROWNUM <=(SELECT CASE MOD(COUNT(1),2)WHEN 0 THEN(COUNT(1)/2) + 1.ELSE ROUND(COUNT(1)/2) END FROM table_name)MINUS.SELECT * FROM table_name.WHERE ROWNUM < (SELECT (COUNT(1)/2) FROM table_name)
How do you check if a table exists in SQL?
To check if table exists in a database you need to use a Select statement on the information schema TABLES or you can use the metadata function OBJECT_ID(). The INFORMATION_SCHEMA. TABLES returns one row for each table in the current database.
How do you find top 5 salary in SQL?
select max(salary), dept_id from employee where salary not in(select max(salary) from employee) group by dept_id; Hope, this will give better idea on queries to get max number and with respect to other field. Suppose if you have rank in column and would like you to find rank, then make sure use MIN in place of MAX.
How do I get the first 10 records 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 find the specific number of rows in SQL?
The SQL COUNT() function returns the number of rows in a table satisfying the criteria specified in the WHERE clause. It sets the number of rows or non NULL column values. COUNT() returns 0 if there were no matching rows.
How do I get last 10 rows in SQL?
The code should go: SELECT * FROM table_name LIMIT 100,10; for the above case assume that you have 110 rows from the table and you want to select the last ten, 100 is the row you want to start to print(if you are to print), and ten shows how many rows you want to pick from the table.
Is Newid random?
The key here is the NEWID function, which generates a globally unique identifier (GUID) in memory for each row. By definition, the GUID is unique and fairly random; so, when you sort by that GUID with the ORDER BY clause, you get a random ordering of the rows in the table.
How do I select random rows in postgresql?
postgresql order by random(), select rows in random order:select your_columns from your_table ORDER BY random()select * from (select distinct your_columns from your_table) table_alias ORDER BY random()select your_columns from your_table ORDER BY random() limit 1.
How do I get bottom 10 records in SQL?
SELECT * FROM ( SELECT * FROM yourTableName ORDER BY id DESC LIMIT 10 )Var1 ORDER BY id ASC; Let us now implement the above query. mysql> SELECT * FROM ( -> SELECT * FROM Last10RecordsDemo ORDER BY id DESC LIMIT 10 -> )Var1 -> -> ORDER BY id ASC; The following is the output that displays the last 10 records.
How do I skip the first 10 rows in SQL?
In order to do this in SQL Server, you must order the query by a column, so you can specify the rows you want. Do you want something like in LINQ skip 5 and take 10? SELECT TOP(10) * FROM MY_TABLE WHERE ID not in (SELECT TOP(5) ID From My_TABLE); This approach will work in any SQL version.
Does not exist SQL query?
The SQL NOT EXISTS Operator will act quite opposite to EXISTS Operator. It is used to restrict the number of rows returned by the SELECT Statement. The NOT EXISTS in SQL Server will check the Subquery for rows existence, and if there are no rows then it will return TRUE, otherwise FALSE.
How do I find an existing record in SQL?
SQL EXISTS OperatorSELECT column_name(s) FROM table_name. WHERE EXISTS. (SELECT column_name FROM table_name WHERE condition);Example. SELECT SupplierName. FROM Suppliers. WHERE EXISTS (SELECT ProductName FROM Products WHERE Products.SupplierID = Suppliers.supplierID AND Price < 20);Example. SELECT SupplierName. FROM Suppliers.
What is offset in SQL query?
The OFFSET and FETCH clauses are the options of the ORDER BY clause. They allow you to limit the number of rows to be returned by a query. In this syntax: The OFFSET clause specifies the number of rows to skip before starting to return rows from the query.
Can we use offset without order by?
You cannot avoid using the required syntax of a ORDER BY with OFFSET and FETCH. It is however possible to disassociate the ORDER BY clause that you must provide in order to perform paging from the natural table order created by the record insert process.
How do I select duplicate rows in SQL?
Using GROUP BY clause to find duplicates in a tableFirst, the GROUP BY clause groups the rows into groups by values in both a and b columns.Second, the COUNT() function returns the number of occurrences of each group (a,b).More items…
What is pivoting in SQL?
SQL Server PIVOT operator rotates a table-valued expression. It turns the unique values in one column into multiple columns in the output and performs aggregations on any remaining column values.