science

Module SQL

Module SQL is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Module SQL rather than just read about it. In short: Module SQL is a method of combining the computing power of a programming language and the database manipulation capabilities of SQL. Module SQL statements are SQL statements written in an SQL client module, that can be called as routines from the host language program source code like a host language routine.

Key takeaways

Module SQL belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Module SQL to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Module SQL from memory before moving on to harder problems.

Reference excerpt

Module SQL is a method of combining the computing power of a programming language and the database manipulation capabilities of SQL. Module SQL statements are SQL statements written in an SQL client module, that can be called as routines from the host language program source code like a host language routine. An SQL standard Module Language file is compiled into calls to a SQL runtime library that interacts with the Database management system. This allows programmers to call SQL statements from applications written in regular programming languages. Using Module Language is very straightforward: place all SQL code in a separate module, and define an interface between the module containing the SQL code and the host program. Module SQL is closely related to Embedded SQL. "SQL client modules are self-contained collections of SQL statements. Unlike embedded SQL, in which the SQL statements are inserted into the host programming language, SQL client modules are separate from the host language. The host language contains calls that invoke the module, which in turn executes the SQL statements within that module."

SQL Standard Compliance The SQL:2023 standard (ISO/IEC 9075-2:2023 Information technology — Database languages SQL — Part 2: Foundation (SQL/Foundation), chapter 13) defines an SQL module as an SQL client module, and the language in which SQL queries are called is referred to as the host language. Specified host languages are:

Ada - Feature B111, “Module language Ada” C - Feature B112, “Module language C” COBOL - Feature B113, “Module language COBOL” Fortran - Feature B114, “Module language Fortran” MUMPS - Feature B115, “Module language MUMPS” Pascal - Feature B116, “Module language Pascal” PL/I - Feature B117, “Module language PL/I” (All the languages listed above are optional features, which means that each vendor can decide which language(s) to support.)

Database systems that support module SQL

Mimer SQL Mimer SQL 11.0 and later for Linux, macOS, OpenVMS and Windows support module SQL for C/C++, and Mimer SQL for OpenVMS also supports module SQL for COBOL, Fortran and Pascal.

Oracle Database Oracle 8.0 supported SQL*Module for Ada but support has been removed in later versions. SQL*Module is a module language that supports the Ada83 language standard for Ada.

Oracle Rdb Supported host languages are Ada, BASIC, C, COBOL, Fortran, Pascal and PL/I.

References

External links SQL*Module for Ada Programmer's Guide, Release 8.0 Module SQL, Mimer SQL Developer

Worked examples

Example 1 — a first encounter with Module SQL

Start with the simplest possible case. Write down what Module SQL claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Module SQL before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Module SQL ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Module SQL

In research: Module SQL appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Module SQL in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Module SQL is common in secondary-school and first-year university syllabi. It links to neighbouring topics Data modeling languages, Database APIs, Declarative programming languages, so understanding it makes those chapters shorter.
In everyday life: Look for Module SQL outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Module SQL in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Module SQL means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Module SQL out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Module SQL in simple terms?

Why does Module SQL matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Module SQL?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Module SQL.