How do I create a dynamic variable in SQL?

How do I create a dynamic variable in SQL?

First, declare two variables, @table for holding the name of the table from which you want to query and @sql for holding the dynamic SQL. Second, set the value of the @table variable to production. products . Fourth, call the sp_executesql stored procedure by passing the @sql parameter.

What is an alternative for top clause in SQL?

There is an alternative to TOP clause, which is to use ROWCOUNT. Use ROWCOUNT with care, as it can lead you into all sorts of problems if it’s not turned off. This is new from SQL Server 2005 and onwards and looks really useful.

How do I select the highest top value in SQL?

The 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.
3. Oracle 12 Syntax: SELECT column_name(s) FROM table_name.
4. Older Oracle Syntax: SELECT column_name(s)
5. Older Oracle Syntax (with ORDER BY): SELECT *

How do you select the highest 3 values in SQL?

In sql server you could do select top 3 * from Test order by f1 desc . Other DBMS’s have similar posibilities such as MySql’s limit , Oracle’s rownum etc.

How do you perform top and record in SQL?

SQL TOP, LIMIT, FETCH FIRST or ROWNUM 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.
3. Oracle 12 Syntax: SELECT column_name(s)
4. Older Oracle Syntax: SELECT column_name(s)
5. Older Oracle Syntax (with ORDER BY): SELECT *

What is static SQL?

Static SQL refers to those SQL statements which are fixed and can be hard coded into the application. As static sqls are fixed queries, these statements can be analysed and optimized and do not require any specific handling for security purpose.

How do I ensure no duplicates in SQL?

3 Answers

1. Open SQL Server Management Studio.
2. Expand the Tables folder of the database where you wish to create the constraint.
3. Right-click the table where you wish to add the constraint and click Design.
4. In Table Designer, click on Indexes/Keys.
5. Click Add.
6. Choose Unique Key in the Type drop-down list.

How do I display top 10 values in SQL?

Is it possible to use a variable in the top clause?

Yes, in SQL Server 2005 it’s possible to use a variable in the top clause. SQL Server 2005 actually allows us to parameterize the TOP clause, using a variable, expression or statement. So you can do things like: In 2005 and later, you can do it as there are several replies in this thread.

What is the use of top clause in SQL Server?

The TOP clause allows us to limit the result set of the queries according to the number of rows or the percentage of rows. In general, the TOP and ORDER BY construction are used together. Otherwise, the TOP clause will return the N number of rows in an uncertain order.

What is a local variable in SQL Server?

In SQL Server, local variables are used to store data during the batch execution period. The local variables can be created for different data types and can also be assigned values. Additionally, variable assigned values can be changed during the execution period.

What is the difference between top and order by in SQL?

When you use TOP with the ORDER BY clause, the result set is limited to the first N number of ordered rows. Otherwise, TOP returns the first N number of rows in an undefined order. Use this clause to specify the number of rows returned from a SELECT statement.