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Follow the links below to find material targeted to the unit's elements, performance criteria, required skills and knowledge

Elements and Performance Criteria

1. Determine requirements of developing queries
   • Identify terminologies applicable to query language
   • Identify and build queries using required tools and environment
2. Write queries to extract required information
   • Sort and selectively retrieve values through query writing
   • Aggregate records by multiple attributes using an expression
   • Sort and filter aggregated records using an expression
   • Create queries and retrieve records from multiple tables
   • Retrieve records from multiple tables using different expressions and approaches
   • Filter records from multiple tables using an expression
   • Retrieve records from multiple tables using expressions, set operators and set logic
   • Construct and execute sub-queries
3. Perform calculations and use expressions in queries
   • Perform a calculation on numeric values and an operation on text values using an expression
   • Perform an operation on date and time values using functions
   • Aggregate values and obtain required output using an expression
4. Create and manipulate tables
   • Identify required columns, data types, keys, relationships, indexes and constraints
   • Manipulate tables according to specific requirements
5. Create and use views and stored procedures
   • Create views according to information requirements
   • Retrieve and save data using a view and transactions
   • Drop a view from a database
   • Retrieve, insert and modify data using created and stored procedures according to information requirements
   • Create and execute stored procedures using one or more parameters
   • Drop a stored procedure from database
   • Create and test database triggers and perform specific required data-related functions

Performance Evidence

The candidate must demonstrate the ability to complete the tasks outlined in the elements, performance criteria and foundation skills of this unit, including evidence of the ability to:

develop, store and execute at least three queries, and retrieve and extract data at least three times

perform at least three calculations using control statements, operators and functions

prepare and manipulate at least three tables to meet specific requirements

create and use at least two views and at least two stored procedures according to task requirements.

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Knowledge Evidence

The candidate must be able to demonstrate knowledge to complete the tasks outlined in the elements, performance criteria and foundation skills of this unit, including knowledge of:

information gathering methods that may be used to apply query language in relational databases

industry standard database management systems (DBMS)

methods of connecting to DBMS

using data definition language (DDL), data manipulation language (DML) and data control language (DCL)

data analysis techniques

data mining

data source characteristics

information system features

required systems and procedures that may be used to apply query language in relational databases.

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