- check constraints
- контрольные ограничения
Англо-русский словарь по вычислительной технике и информационным технологиям - 4-е изд.. Сергей Орлов .
check constraints
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Check Constraint — A check constraint (also known as table check constraint) is a condition that defines valid data when adding or updating an entry in a table of a relational database. A check constraint is applied to each row in the table. The constraint must be… … Wikipedia
Low-density parity-check code — In information theory, a low density parity check code (LDPC code) is an error correcting code, a method of transmitting a message over a noisy transmission channel. [David J.C. MacKay (2003) Information theory, inference and learning algorithms … Wikipedia
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Thinking processes (Theory of Constraints) — * (This page is about Theory of constraints. Wikipedia also has a List of thought processes.Thinking processes in Eliyahu M. Goldratt s Theory of Constraints, are the five methods to enable the focused improvement of any system (especially… … Wikipedia
Null (SQL) — The Greek lowercase omega (ω) character is used to represent Null in database theory. Null is a special marker used in Structured Query Language (SQL) to indicate that a data value does not exist in the database. Introduced by the creator of the… … Wikipedia
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Relational database — A visual diagram showing the relationship between the two tables, as indicated by the arrow A relational database matches data by using common characteristics found within the data set. The resulting groups of data uses the relational model (a… … Wikipedia
Insert (SQL) — An SQL INSERT statement adds one or more records to any single table in a relational database. Basic formInsert statements have the following form: * INSERT INTO table ( column1 , [ column2, ... ] ) VALUES ( value1 , [ value2, ... ] )The number… … Wikipedia
Comparison of relational database management systems — Programming language comparisons General comparison Basic syntax Basic instructions Arrays Associative arrays String operations … Wikipedia
Update (SQL) — A SQL UPDATE statement that changes the data of one or more records in a table. Either all the rows can be updated, or a subset may be chosen using a condition.The UPDATE statement has the following form… … Wikipedia
Ternary logic — A ternary, three valued or trivalent logic (sometimes abbreviated 3VL) is a term to describe any of several multi valued logic systems in which there are three truth values indicating true , false and some third value. This is contrasted with the … Wikipedia
