How is SQL compiled?

Question

PL/SQL executes in a virtual machine, and it first translates (compiles) your code into virtual machine code, sometimes called bytecode or mcode. This is basically the same model that Java uses. When it is time to actually run your code, however, that bytecode is translated (interpreted) into system calls.

Does SQL get compiled?

SQL is a fourth-generation language, meaning it is a scripting language that does not require compiling to run. Like most fourth-generation languages, SQL requires an interpreter that translates rather than compiles code. As with all languages, SQL has rules for issuing commands and queries.

How are SQL queries compiled?

The query processor goes through three phases before producing a plan from a query that you submit. First, it parses and normalizes the statements. Then it compiles the Transact SQL (T-SQL) code. Finally, it optimizes the SQL statement.

Which compiler is used in SQL?

The SQL and XQuery compiler analyzes the query to validate the syntax. If any syntax errors are detected, the query compiler stops processing and returns an appropriate error to the application that submitted the query.

How is SQL processed?

To process an SQL statement, a DBMS performs the following five steps: The DBMS first parses the SQL statement. It breaks the statement up into individual words, called tokens, makes sure that the statement has a valid verb and valid clauses, and so on. Syntax errors and misspellings can be detected in this step.

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