Suppose you are having an existing table and you want to add a value all rows of the column. 
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Suppose you are having an existing table and you want to add a value all rows of the column. 
To create a new column in an existing table, you use ALTER Table query with ADD COLUMN in it.
To select rows in which a particular column value contains a particular word, use LIKE and in inv
To create a single line comment in PostgresSQL, you use two hashes --
For example:
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To retrieve data from a table in a MySQL database using the SELECT statement, you can use various clauses to filter, sort, and manipulate the data. Here’s a guide to help you get started:
Basic Syntax
SELECT column1, column2, ...
FROM table_name;
- column1, column2, ...: The columns you want to retrieve. You can also use to select all columns.
- table_name: The name of the table you want to query.
Examples of SELECT Statements
1. Select All Columns:
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