How to Use SQL

What is SQL and SQL Server?

SQL is used to speak with a database. According to ANSI (American National Standards Institute), it’s far the same old language for relational database management systems. It is used to carry out operations at the facts present in the database. SQL statements are used to perform duties which includes update data on a database or retrieve data from a database.

SQL Server is an RDBMS. It helps an extensive range of transaction processing, BI and analytics applications in IT environments. It is developed by using Microsoft. It is both GUI and a command based totally software.

What is Data Type and How to Use Data Types in SQL

What is meant by data type in database or programming languages? Datatype means what kind of data you want to store in that variable or column. For example, if you want to store the name of customer you most select string or varchar data type of that column, not number datatype.

There are three basic data types in SQL.

• Numeric
• Date and Time
• String Types.

We divide these three data types further in multiple subcategories:

Numeric Data Type:

• INT
• TINYINT
• SMALLINT
• BIGINT
• FLOAT(M, D)
• DOUBLE(SIZE, D)
• DECIMAL(SIZE, D)

Date and Time:

• DATE
• DATETIME
• TIMESTAMP

String Types:

• CHAR(SIZE)
• VARCHAR(SIZE)
• TEXT
• ENUM

What are the SELECT, FROM, and WHERE Clause? How to use them?

• SELECT Clause

Almost every query in the SQL start with select clause and we can say it the foundation of every query. Select clause help which column you want to see.

• FROM Clause

In SQL FROM clause tells us about the table. In FROM clause we write the table name.

• WHERE Clause

In WHERE clause we write the condition or specific scenario of the query.

How to use SQL for Inserting, Deleting, Updating, and Creating Table or Data?

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

How to Use 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 ] ;

How to Use Insertion Query in MySQL

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 ;

How to Use Update Query in MySQL

After MySQL login most of the time we need to change the record in our database without changing all records or values. For this purpose, MySQL 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 ] ;

How do I start a SQL query?

Where do I start with SQL?

How can I learn SQL quickly?

How can I practice SQL at home?

Is SQL coding difficult?

Is Python better than SQL?

Is SQL a coding?

Is Python harder than SQL?

Should I start with SQL or python?

Should I learn SQL or Python first?

What SQL Cannot do?

Can I get a job just knowing SQL?

Is NoSQL easier than SQL?

What is difference between SQL and MySQL?

Should I learn SQL or MySQL?

Can I learn MySQL without SQL?

Is my SQL free?