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Showing posts with the label SQL DDL

Electric Vehicles (EVs) : Benefits, Careers, Considerations ,Opportunities and Challenges

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  Electric Drive: Benefits, Careers, and Considerations   Overview of Electric Vehicles (EVs) What are Electric Vehicles (EVs)? Electric vehicles (EVs) are vehicles that are powered entirely or partially by electricity instead of traditional fossil fuels like gasoline or diesel. EVs use electric motors and are typically powered by rechargeable batteries. Benefits of Electric Vehicles 1.      Environmental Benefits : ·          Lower Emissions : EVs produce zero tailpipe emissions, reducing air pollution and greenhouse gas emissions. ·          Reduced Noise Pollution : Electric motors are quieter than internal combustion engines. 2.      Economic Benefits : ·          Lower Operating Costs : Electricity is cheaper than gasoline, and EVs have fewer moving parts, leading to lower maintenance costs. ·...
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SQL DDL (Data Definition Language) queries with examples:

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DDL stands for Data Definition Language. It is a subset of SQL (Structured Query Language) used for defining and managing the structure of a relational database. DDL commands enable database administrators and users to create, modify, and delete database objects such as tables, indexes, and views.   Here are details of some SQL DDL (Data Definition Language) queries with examples: CREATE TABLE: Description: Used to create a new table in the database. Example: CREATE TABLE employees (   emp_id INT PRIMARY KEY, emp_name VARCHAR(50), emp_salary DECIMAL(10, 2) ); ALTER TABLE: Description: Used to modify the structure of an existing table. Example: ALTER TABLE employees ADD COLUMN emp_department VARCHAR(30); DROP TABLE: Description: Used to delete an entire table along with its data and structure. Example: DROP TABLE employees; CREATE INDEX: Description: Used to create an index to ...
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