How to Run Sql Query

What is SQL Server and Query in SQL?

SQL Server is Microsoft’s relational database control system. The key operating word right here is system; the system’s characteristic is to control more than one databases. It additionally offers a set of gear that helps to construct, alternate, and manage the information. Additionally, there is equipment for record writing, information import/export, and information evaluation tools. A query is the statements for interacting with databases and tables.

Basic Clauses for Running the SQL Queries

Name of clauses:

• SELECT
• FROM
• WHERE

Example and Explanation of the above clauses.

SELECT name of columns

                FROM name of table

                Where conditions [ optional ]

SELECT Clause: In the select statement, you can write the name of columns those you want to display in-store in the temporary table.

FROM Clause: In into clause write the table name that data you want to store in the temporary table.

WHERE Clause: In where clause writes the condition it’s optional.

Example of a Running Query on Table

Let’s spouse a products table exists in my database, then for displaying table data query is given below:

SELECT product_name, list_price

FROM products

WHERE brand_id = 9 s;

Also, SQL provides a lot of queries.

Running Operational Queries on Table Data in SQL

SQL provides a lot of Queries for interacting with databases or tables in SQL. Explanation of each query is given below: 

Run Deletion Query in SQL

SQL provides the simplest query for deleting a record from the table. Using Delete query we can’t delete a single attribute from the whole record. We delete something from a table on the base of a specific condition.

Delete from relation / table
where [ condition ] ;

Run Insertion Query in SQL

After SQL login, we can insert a record or attribute into the table or relation. The simplest insert query is a request to add one record or tuple into the table.

insert into tableName
values ( ’ value1 ’ ,  ’ value2 ’ , ’ value3 ’ , . . .  ) ;

We can also insert a record from one to another table using insert query.

insert into table1

select attribute1 , attribute1 , attribute1 , . . .

from table2

where [ condition1] AND [ condition2 ] ;

We can also copy all records from one table to another table using an insert statement

insert into table1

select *

from table2 ;

Run Update Query in SQL

After SQL login most of the time we need to change the record in our database without changing all records or values. For this purpose, SQL provides the simplest query for updating a specific record or tuple.

update table
set Attribute1 = value , Attribute2 = value , Attribute3 = value , . . . ;

Above is the simplest updating query. We can update a record on the base of specific condition.

update Table
set Attribute1 = value , Attribute2 = value , Attribute3 = value , . . . ;
where [ condition ] ;

Run SQL Query using Java Code

Example JDBC program:

// Query1.java: Query an mSQL database using JDBC.
import java.sql.*;
/**
* A JDBC SELECT (JDBC query) example program.
*/
class Query1 {
public static void main (String[] args) {
try          {

String url = ‘jdbc:msql://200.210.220.1:1114/Demo’;
Connection conn = DriverManager.getConnection(url,”,”);
Statement stmt = conn.createStatement();
ResultSet rs;
rs = stmt.executeQuery(‘SELECT Lname FROM Customers WHERE Snum = 2001’);
while ( rs.next() ) {
String lastName = rs.getString(‘Lname’);
System.out.println(lastName);

}
conn.close();

} catch (Exception e) {
System.err.println(‘Got an exception! ‘);
System.err.println(e.getMessage());

}

}
}

Run the Query for Creating an Index in SQL

There are many queries are available in SQL to use or create an index in your table. The basic syntax for creating an index in SQL is given below:

CREATE INDEX index_name
ON table_name ( column1 , column2 , . . . ) ;

Above is the simple syntax for an index in a table. But in the above index, there is no restriction on duplicate values.

Below is a query for unique value in a table. Means every record of this table will unique according to its primary key.

CREATE UNIQUE INDEX index_name
ON table_name ( column1 , column2 , . . . ) ;

How do I run a SQL query in Windows?

How do you run a query?

What is a query tool?

How do I run a query in Excel?

Why is SQL better than Excel?

How do I write a SQL query formula in Excel?

Which tab can help start a query?

How do I start a query without a query wizard?

Which are the two main types of query technique?

What are the types of query?

What is a query give example?

Which is not a query type?

What are the types of commands in SQL?

What are the 5 basic SQL commands?

Can I teach myself SQL?

What are DML commands?

What are the 2 types of DML?

What are two types of DML?