The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!
From the Wiki University
What evidence can you provide to prove your understanding of each of the following citeria?
Write a simple SQL statement to retrieve and sort data
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Retrieve all the data from a single table Completed |
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Retrieve data from specific columns in a single table Completed |
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Use 'order by' to sort query output Completed |
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Write an SQL statement that selectively retrieves data
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Restrict the number of rows retrieved by placing criteria in the 'where' clause Completed |
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Restrict the number of rows retrieved by placing specific criteria in the select statement Completed |
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Use comparisonoperators in the 'where' clause to compare numeric, character, string, date and time data Completed |
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Use Booleanoperators with the correct precedence Completed |
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Use criteria in the 'where' clause to check for a range of values, to select values from a list, and to check for values that match a pattern Completed |
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Use SQL syntax to suppress duplicate values from query results Completed |
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Take action to exclude null values from a query result Completed |
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Write SQL statements that use functions
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Use arithmeticaloperators with the correct precedence Completed |
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Use string functions and operators to obtain the required query output Completed |
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Use mathematicalfunctions to obtain the required output, where required Completed |
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Use date functions to obtain the required output Completed |
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Use SQL aggregate functions to obtain the required output Completed |
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Write SQL statements that use aggregation and filtering
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Use 'group by' to aggregate data by multiple columns Completed |
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Sort aggregated data in the query output Completed |
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Filter aggregated data using the 'having' clause Completed |
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Write SQL statements that retrieve data from multiple tables
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Employ the inner join syntax to retrieve data from two or more tables Completed |
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Use 'left outer', 'right outer' and 'full outer' syntax to join tables in the select statement Completed |
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Use correct syntax in the 'where' clause to retrieve data from multiple tables Completed |
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Write a union query that retrieves data from more than one table Completed |
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Write and execute SQL sub-queries
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Construct single and nested sub-queries Completed |
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Construct sub-queries that return a single row, and multiple rows Completed |
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Use correlated sub-queries to retrieve required data Completed |
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Write sub-queries that use aggregates Completed |
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Create and manipulate tables
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Identify required columns, data types, keys, relationships, indexes and constraints Completed |
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Use relevant naming conventions for all database elements Completed |
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Create tables that implement all required elements Completed |
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Insert rows into tables Completed |
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Update some or all of the data in a table Completed |
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Add columns to a table Completed |
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Modify a column within a table Completed |
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Delete a column from a table Completed |
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Delete rows from a table Completed |
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View detailed information regarding a table Completed |
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Delete tables with regard to referential integrity rules Completed |
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Create and use views
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Create views that satisfy informationrequirements Completed |
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Use check constraints in a view Completed |
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Retrieve, insert, update and delete data using a view Completed |
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Drop a view from a database Completed |
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Create and use stored procedures
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Create and execute stored procedures that use SQL to retrieve, insert or modify data according to informationrequirements Completed |
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Create and execute stored procedures that use one or more parameters Completed |
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Drop a stored procedure from the database Completed |
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Create and test database triggers that automate data management or perform specific required data-related functions Completed |
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