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The CASE expression, for example, enables SQL to perform conditional branching within queries, providing a mechanism to return different values based on evaluated conditions. This logic can be particularly useful for data transformation during retrieval, especially in SELECT statements.
Complex SQL statements can be used like sub-selects, joins and stored procedures. Scriptcase allows users to write PHP code to handle exceptions and create more complex validation. It is also possible to create infrastructure such as menus, login screens and a security system with authentication.
SQL statements also include the semicolon (";") statement terminator. Though not required on every platform, it is defined as a standard part of the SQL grammar. Insignificant whitespace is generally ignored in SQL statements and queries, making it easier to format SQL code for readability.
SQL Developer Data Modeler operates with and models metadata. [7] Prior to SQL Developer version 3, it constituted a separate (but integrated) free [8] counterpart of SQL Developer. As of SQL Developer version 3 modeling became an integrated part of the overall tool. "Data Modeler" can produce (among other outputs) .dmd files. [9] Data Miner [10]
In very early versions of the SQL standard the return code was called SQLCODE and used a different coding schema. 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.
SQL statements are used to perform tasks such as insert data to a database, delete or update data in a database, or retrieve data from a database. Though database systems use SQL, they also have their own additional proprietary extensions that are usually only used on their system.
SQL syntax#Conditional (CASE) expressions To a section : This is a redirect from a topic that does not have its own page to a section of a page on the subject. For redirects to embedded anchors on a page, use {{ R to anchor }} instead .
The SQL SELECT statement returns a result set of rows, from one or more tables. [1] [2] 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.