| database/sql | Package sql provides a generic interface around SQL (or SQL-like) databases. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| math/rand | Package rand implements pseudo-random number generators suitable for tasks such as simulation, but it should not be used for security-sensitive work. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| time | Package time provides functionality for measuring and displaying time. |