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KwickClips Databases and SQL

Databases and SQL: 71 short revision clips (page 2)

One idea per clip, with the answer written out underneath. Each clip links back to the full Databases and SQL lesson it came from.

Cartesian product table showing every row paired with every row.How do you get the row count?44 secEqui-join query with a WHERE condition on the common column.What makes a join an equi-join?41 secNATURAL JOIN query with the common column appearing once.What happens if no column name matches?40 secBOOKS table with a field and a record labelled.What is a record?40 secSQL query using SELECT, FROM, WHERE and ORDER BY on a BOOKS table.Which keyword sorts largest first?45 secSQL script with gaps and the completed answer beside it.Why do marks get lost?42 secValidation checks listed with an example for each.What is the difference between validation and verification?41 secBase wizard steps for creating a new database file.Which file extension does Base use?42 secDesign View grid with AdmNo as Integer and a description.What does one row of the Design View grid represent?40 secField types list with a primary key icon set on AdmNo.How do you set a primary key in Base?41 secBase table data view with a record being edited and a row selected.When is a record saved?41 secReel explaining redundancy and linking two tables by admission number.What is redundancy?41 secTable of three relationship types with locker, fee receipt and subject examples.Which relationship is most common?41 secThree steps to create a relationship in LibreOffice Base.Where do you create a relationship?41 secReel on referential integrity: foreign keys must exist in the parent table.What is an orphan record?40 secThree Query Wizard steps in LibreOffice Base.Where do you start?41 secSteps to build a query in LibreOffice Base Design View.How many fields go in one grid column?42 secCriterion row examples >= 80, 'Surat' and LIKE 'R*'.How do you write a text value?42 secReel on the Sort and Visible rows in a Base query.Does a hidden field still filter?41 secReel on using a Base form for data entry.Where does form data go?42 secForm Wizard steps in LibreOffice Base.What does New data only give?42 secReport Wizard steps for a printable result sheet in Base.Can a report change data?41 secFixes for a Base report with columns cut off: landscape, margins, print preview.Portrait or landscape: which is wide?41 sec
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Full Databases and SQL lessonsAll KwickClips

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