What does sql mean?

Structured Query Language (SQL for short) is a special purpose programming language, a database query and programming language, which is used to access data, query, update and manage relational database systems.

structured query language is an advanced non-procedural programming language, which allows users to work on high-level data structures. It does not require users to specify the storage method of data, nor does it require users to know the specific storage method of data.

Therefore, different database systems with completely different underlying structures can use the same structured query language as the interface for data input and management. Structured query language statements can be nested, which makes it extremely flexible and powerful.

purpose: update the original data in the table

for independent use, and use where to match the field

set to update the field value, which can be one item at a time. You can also do more than one

example at a time:

original data in the "Person" table:

LastName first name address city

Nielsen Fred Kirk GT 56 stavanger

Rasmussen Storgt 67

Run the following SQL to put the last name in the person table. The FirstName with the segment "Rasmussen" is updated to "Nina":

Update Person Set First Name =' Nina' Where Last Name =' Rasmussen'.