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Articles tagged with #sqltutorial
The CHECK constraint ensures that the values in a column meet a specific condition. It is used to enforce business rules at the database level, ensuring data integrity. Syntax of CHECK Constraint CREATE TABLE table_name ( column1 datatype CHECK ...
The DROP statement in SQL is used to permanently remove an entire database, table, or column from the system. Unlike DELETE, which removes specific rows, DROP completely deletes the structure and data. Syntax for DROP 1. Drop a Table DROP TABLE tabl...
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,...
