How to Learn Database SQL Technology

Structured Query Language (SQL) is a language that was developed by IBM for processing data in mainframe databases. The relational nature of databases and the ease of SQL usage has made SQL the standard language for databases. SQL technology is also standardized which makes it ideal for usage across multiple fields. Learning SQL database technology will enable you to program and maintain any database with ease.

Instructions

Difficulty: Challenging

1. Review the structure of SQL—tables consisting of rows and columns. Each table contains data definitions, names and types of data and data value constraints on the columns and rows.
2. In a database program such as Microsoft Access, use your cursor or a general query specification to manipulate data. All arithmetic operations, comparison and string matching, universal and existential quantifiers, summary, max/min, count/sum and partition grouping is used in SQL language.
3. Understand SQL database commands. Embedded within the language are programming languages such as Ada, C, COBOL, FORTRAN, MUMPS, Pascal and PL/1.
4. Define application views. The views will depend upon the database operations you choose.
5. Practice creating relationships between rows, columns and tables. Depending upon what you want your database to do, you will enter different commands in different rows and columns.
6. Run your database to see if you have been successful. If the technology is not doing what you want, retrace your steps to find the flaw in your database. You may need to start again before you get your program written correctly.

Tips & Warnings

• SQL does not require knowledge of coding.
• SQL databases can retrieve large amounts of data quickly because the data is stored in one place. This also means your data is more secure.

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