The ALTER TABLE statement in SQL is used to modify an existing table’s structure. It allows you to add, delete, or modify columns, as well as change constraints and other properties of a table. Syntax for ALTER TABLE ALTER TABLE table_name ADD/MODIF...
The DELETE statement in SQL is used to remove one or more rows from a table based on a condition. It is commonly used when data needs to be removed permanently from a database. Syntax for DELETE DELETE FROM table_name WHERE condition; table_name: ...
The UPDATE statement in SQL is used to modify existing data in a table. It allows you to change one or more columns for specific rows based on a condition. Syntax for UPDATE UPDATE table_name SET column1 = value1, column2 = value2, ... WHERE conditi...
The INSERT statement in SQL is used to add new rows of data into a table. You can insert a single row, multiple rows, or use the result of a query to populate data into a table. Syntax for INSERT 1. Insert Single Row INSERT INTO table_name (column1,...
The CREATE TABLE statement in SQL is used to create a new table in a database. You define the table structure, including the column names, data types, and any constraints. Syntax for CREATE TABLE CREATE TABLE table_name ( column1 datatype constr...
Beginner Functions 1. COUNT() What It Does: Counts the number of rows in a table or rows that meet a specific condition. Analogy: Think of a classroom with students, and you're counting how many students are wearing blue shirts. Example: SELECT ...
