Can you name the main data types used in databases?

The main data types used in databases can be divided into several categories:

• Numeric types: for storing integers and floating-point numbers.

  • INT, BIGINT, SMALLINT — integers of different sizes.
  • DECIMAL, NUMERIC — exact numbers with fixed precision.
  • FLOAT, DOUBLE — floating-point numbers.

• String types:

  • CHAR(n) — fixed-length string.
  • VARCHAR(n) — variable-length string.
  • TEXT — large text data.

• Date and time:

  • DATE — date.
  • TIME — time.
  • DATETIME, TIMESTAMP — date and time.

• Boolean types:

  • BOOLEAN — logical value (true/false).

• Other types:

  • BLOB — binary large objects (e.g., images).
  • ENUM — enumeration of fixed values.

Different DBMSs may have their own features and additional types, but the ones listed are the most common.