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  2. SQL syntax - Wikipedia

    en.wikipedia.org/wiki/SQL_syntax

    A derived table is the use of referencing an SQL subquery in a FROM clause. Essentially, the derived table is a subquery that can be selected from or joined to. The derived table functionality allows the user to reference the subquery as a table. The derived table is sometimes referred to as an inline view or a subselect.

  3. Check constraint - Wikipedia

    en.wikipedia.org/wiki/Check_constraint

    Each check constraint has to be defined in the CREATE TABLE or ALTER TABLE statement using the syntax: CREATE TABLE table_name ( ..., CONSTRAINT constraint_name CHECK ( predicate), ... ) ALTER TABLE table_name ADD CONSTRAINT constraint_name CHECK ( predicate) If the check constraint refers to a single column only, it is possible to specify the ...

  4. SQLSTATE - Wikipedia

    en.wikipedia.org/wiki/SQLSTATE

    The following table lists the standard-conforming values - based on SQL:2011. [1] The table's last column shows the part of the standard that defines the row. If it is empty, the definition originates from part 2 Foundation .

  5. Data definition language - Wikipedia

    en.wikipedia.org/wiki/Data_definition_language

    The ALTER statement modifies an existing database object. An ALTER statement in SQL changes the properties of an object inside of a relational database management system (RDBMS). The types of objects that can be altered depends on which RDBMS is being used. The typical usage is: ALTER objecttype objectname parameters.

  6. Select (SQL) - Wikipedia

    en.wikipedia.org/wiki/Select_(SQL)

    A SELECT statement retrieves zero or more rows from one or more database tables or database views. In most applications, SELECT is the most commonly used data manipulation language (DML) command. As SQL is a declarative programming language, SELECT queries specify a result set, but do not specify how to calculate it.

  7. Comparison of database administration tools - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_database...

    Create/alter table: Yes - can create table, alter its definition and data, and add new rows; Some - can only create/alter table definition, not data; Browse table: Yes - can browse table definition and data; Some - can only browse table definition; Multi-server support: Yes - can manage from the same window/session multiple servers

  8. Update (SQL) - Wikipedia

    en.wikipedia.org/wiki/Update_(SQL)

    An SQL UPDATE statement 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: [1] UPDATE table_name SET column_name = value [, column_name = value ...] [WHERE condition]

  9. Data query language - Wikipedia

    en.wikipedia.org/wiki/Data_query_language

    Data query language (DQL) is part of the base grouping of SQL sub-languages. These sub-languages are mainly categorized into four categories: a data query language (DQL), a data definition language (DDL), a data control language (DCL), and a data manipulation language (DML).