db implementation - knukiyang/teaching/gdb/s20/... · 2020. 5. 7. · access queries: sort & filter...

DB Implementation:

MS Access Queries

MS Access Queries Database Queries

Core DBA skill → A way of searching for & extracting data from tablestable에서 data를 검색하거나 추출하는 방법

What does it do? Find target information → Retrieve, Filter, Sort, Aggregate/Summarize Manipulate data → Add, Change, Delete, Combine (& calculate) data in tables Assemble/Supply data → for Forms and Reports

How does it work? Query object ⇒ SQL & a dynaset (“live” view of table)

• Data changes made in query is reflected in underlying tables

Database Systems Seminar 2

Access Queries: Views Datasheet view

For displaying the result of the query → Useful for reviewing/validating the query Design View

For creating/modifying a query via drag & drop GUI


Object Relationship Pane1. Add tables/queries2. Add fields to the Design Grid

Design Grid3. Sort row → ascending/descending sort4. Show row → show/hide fields5. Criteria row → apply data filter6. Totals row → compute aggregate stats

Access Queries: Basic Types Simple Query

Uses a single table/query• To generate a subset (row/column) of a table

Multi-table Query Joins multiple tables/queries

• Joining tables in Query Design does not permanently link tables

Select Query Selects records that meet given criteria

• Criteria row ← Selection Criteria

Parameter Query Prompts for query criteria values

(parameters) to run a dynamic query• Criteria row ← [Query Prompt]

(or Search Form control name)Database Systems Seminar 4

http://widit2.knu.ac.kr/%7Ekiyang/teaching/gDB/s20/showpageLN.cgi?course=gDB&semester=s20&inf=vid/query-intro.mp4http://widit2.knu.ac.kr/~kiyang/teaching/gDB/s20/showpageLN.cgi?course=gDB&semester=s20&inf=vid/query-intro.mp4

Access Queries: Sort & Filter Design View

Sort using the Sort Row• Sort priority is from left to right for multiple sort

Filter using the Criteria Row• AND query ← criteria in a single row• OR query ← criteria in multiple rows• Criteria in a single cell → AND/OR

Query Criteria• Determines which record to include• “expressions” that consist of

→ Constants (e.g., 2000, “Adams”)→ Operators (e.g., >, +, *, AND)→ Functions (e.g., DateDiff)→ Field references (e.g., [Lastname])


- Gcflearnfree.org -

Access Queries: Query Criteria Date/Time fields

Number fields


Expression Returns

Between #1/1/15# and #12/31/15# Dates from 1/1/2015 to 12/31/2015

> #1/1/15# After 1/1/2015

< Date() Before today

DateDiff(“yyyy”,Date(),[Birthdate]) > 60 Over 60 years old

DatePart(“m”, [Birthdate]) = 12 Born in December

Expression Returns

Between 10 and 20 Number from 10 to 20

>= 10 Greater than or equal to 10

10 Equal to 10

Not 10 Not equal to 10

Is Null No value is entered

In (5,10,15) Number equal to 5, 10, or 15

MS Access: Query Criteria

https://support.office.com/en-us/article/examples-of-query-criteria-3197228c-8684-4552-ac03-aba746fb29d8

Access Queries: Query Criteria Text fields


Expression Returns

In (“John”, “Mary”, “Jane”) Equal to John, Mary, or Jane

Like “J*” Starts with “j”

Like “*s” Ends with “s”

Like “*oh*” Contains “oh”

Like “[A-C]??” Starts with A through C and has two more characters

???? Any 4 characters

Len([LastName]) = Val(4) Any LastName of 4 characters

Right([LastName],2) = “es” Any LastName ending in “es” (same as Like “*es”)

Left([LastName],2)= “Ja” Any LastName starting with “Ja” (same as Like “Ja*”)

Is Null No value is entered

Is Not Null Value is not missing

Not “James” Not equal to “James”

Access Queries: Expressions Using expressions to create a Calculated Field

Enter expressions in blank column of query design view• NAME: [Field1] operator [Field2]

Examples Simple math

• DiscountPrice: [Discount] * [StandardPrice]

String Concatenation• Author: [FirstName] & “ ” & [Lastname]

Date & Time math• HireAge: DateDiff(“yyyy”,[BirthDate],[HireDate])

← DateDiff(Interval, BeginDate, EndDate)

• RetireDate: DateAdd(“yyyy”,25,[HireDate])← DateAdd(Interval, Number, Date)

Customized Sorting/Format• Branch: Switch([City]=“Seattle”, 1, [City]=“Redmond”, 2, [City]=“New York”, 3)

← Switch(expr1, value1, expr2, value2, etc.)


Access Queries: Sort & Filter Datasheet View

Common Filters → Filter for specific values1. Click the icon on the right side of the field label2. Check the values for the filter OR3. Click the Range Filter (e.g. Date Filter) & specify the filter value

Filter by Selection → Filter by selected value1. Select a specific value in the datasheet2. Right-click & select a filtering option


Access Queries: Sort & Filter Datasheet View

Filter by Form→ Filter on several fields on a form1. Click Advanced in Sort & Filter group of Home tab2. Select Filter by Form3. Select multiple filter values as needed

Advanced Filter→ Define custom filters→ Learn how to write query criteria1. Create a filter by Common Filter, Selection, or Form2. Click Advanced in Sort & Filter group of Home tab3. Select Advanced Filter/Sort


http://widit2.knu.ac.kr/%7Ekiyang/teaching/gDB/s20/showpageLN.cgi?course=gDB&semester=s20&inf=vid/query-expression.mp4http://widit2.knu.ac.kr/~kiyang/teaching/gDB/s20/showpageLN.cgi?course=gDB&semester=s20&inf=vid/query-expression.mp4

Access Queries: Dynamic Criteria Parameter Queries

Dynamic query based on varying criteria value Enter the parameter name in square brackets in criteria

• Do not use existing field names• Can use expressions → e.g. Like "*" & [Last Name] & "*“


Access Queries: Dynamic Criteria Query Criteria from Form Entries

Use a form to enter query parameter values → good for multiple parameter entries1. Create a parameter query2. Create a search form with unbound input control for each of query parameters3. Add a command button that will run the parameter query

→ Run Query Action of Miscellaneous Category

4. Change the query criteria to search form control names


http://widit2.knu.ac.kr/%7Ekiyang/teaching/gDB/s20/showpageLN.cgi?course=gDB&semester=s20&inf=vid/query-dynamic.mp4http://widit2.knu.ac.kr/~kiyang/teaching/gDB/s20/showpageLN.cgi?course=gDB&semester=s20&inf=vid/query-dynamic.mp4

Access Queries: Joins Inner Join

Default join in Access (i.e. Natural Join)

Returns only the records where joined fields are equal in both tables

Outer join Returns all records from

one of the tables


http://widit2.knu.ac.kr/%7Ekiyang/teaching/gDB/s20/showpageLN.cgi?course=gDB&semester=s20&inf=vid/query-join.mp4http://widit2.knu.ac.kr/~kiyang/teaching/gDB/s20/showpageLN.cgi?course=gDB&semester=s20&inf=vid/query-join.mp4


Access Queries: Advanced Types Action Queries

► Append Query• Appends table rows to an existing table

► Delete Query• Deletes table rows

► Update Query• Modifies the values of particular fields for particular records

► Make Table Query• Creates a new table from rows of other tables/queries

→ will overwrite existing table of the same name

Crosstab Query ► Performs mathematical operations on intersection of two fields

SQL-Specific Queries ► Data-definition Query

• Defines/Changes the definition of a database object (e.g., create/modify a table)

► Union Query• Combines multiple SELECT queries

► Pass-through Query• Send command directly to ODBC database server to run server-side SQL


Access Queries: Action Queries Append Query → Appends table rows to an existing table

1. Create a select query.2. Convert the select query to an Append query

• Append Tool in Query Type group of Design tab3. Choose the destination fields for each column in the append query.4. Run the query to append rows/records.

Delete Query → Deletes table rows1. Create a select query.2. Convert the select query to a Delete query.

• Delete Tool in Query Type group of Design tab3. Run the query to delete rows/records.

Update Query → Modifies the values of particular fields for particular records1. Create a select query.2. Convert the select query to an Update query.

• Update Tool in Query Type group of Design tab3. Set Update To: (and Criteria when appropriate) rows4. Run the query to update fields/columns.

Make Table Query → Creates a new table from rows of other tables/queries1. Create a select query.2. Convert the select query to a Make Table query.

• Make Table Tool in Query Type group of Design tab3. Run the query to update fields/columns.

Access Action Queries

https://www.tutorialspoint.com/ms_access/ms_access_action_queries.htmhttp://widit2.knu.ac.kr/%7Ekiyang/teaching/gDB/s20/showpageLN.cgi?course=gDB&semester=s20&inf=vid/query-action.mp4


Access Queries: Crosstab Query What is a crosstab query?

► To present summary data in a cross-tabulation format

What does it do?► Calculates aggregate functions (e.g., sum, average, count, etc.) by two fields (row by

column).

How to create a crosstab query1. Select the Crosstab Query Wizard.

(Ribbon → Create tab → Query Wizard → Crosstab Wizard)

2. Choose a table or query.3. Select fields to be the “row headings”.4. Select fields to be the “column headings”.5. Select the field and function to calculate.

MS Access: Crosstab Query

http://widit2.knu.ac.kr/%7Ekiyang/teaching/gDB/s20/showpageLN.cgi?course=gDB&semester=s20&inf=vid/query-crosstab.mp4https://support.microsoft.com/en-us/office/make-summary-data-easier-to-read-by-using-a-crosstab-query-8465b89c-2ff2-4cc8-ba60-2cd8484667e8?ui=en-us&rs=en-us&ad=ushttp://widit2.knu.ac.kr/~kiyang/teaching/gDB/s20/showpageLN.cgi?course=gDB&semester=s20&inf=vid/query-crosstab.mp4


Access Queries: SQL Queries Data-definition Query → Defines/Changes the definition of a database object

Create a table• CREATE TABLE table_name

( field1 type(size), field2 type(size), … , PRIMARY KEY (field))

Modify a table• ALTER TABLE table_name

ADD/ALTER COLUMN field type(size)DROP COLUMN field

Union Query → Combines multiple SELECT queries Select queries must have the same fields (i.e., Union compatible)

• SELECT field1, field2, …. FROM table1UNIONSELECT fieldA, fieldB, …. FROM table2

1. Create the select queries in Design view2. Copy & paste SQL statements into a union query

Pass-through Query → Send command directly to ODBC database server to run server-side SQL1. Configure the server DBMS as an ODBC data source2. Create a Pass-through query

MS Access: Data-Definition Query MS Access: Union Query

http://widit2.knu.ac.kr/%7Ekiyang/teaching/gDB/s20/showpageLN.cgi?course=gDB&semester=s20&inf=vid/query-sql.mp4https://support.microsoft.com/en-ie/office/create-or-modify-tables-or-indexes-by-using-a-data-definition-query-d935e129-229b-48d8-9f2d-1d4ee87f418e?ui=en-us&rs=en-ie&ad=ie#tophttps://support.office.com/en-us/article/use-a-union-query-to-combine-multiple-queries-into-a-single-result-1f772ec0-cc73-474d-ab10-ad0a75541c6ehttp://widit2.knu.ac.kr/~kiyang/teaching/gDB/s20/showpageLN.cgi?course=gDB&semester=s20&inf=vid/query-sql.mp4

DB Implementation:MS Access QueriesAccess Queries: ViewsAccess Queries: Basic TypesAccess Queries: Sort & FilterAccess Queries: Query CriteriaAccess Queries: Query CriteriaAccess Queries: ExpressionsAccess Queries: Sort & FilterAccess Queries: Sort & FilterAccess Queries: Dynamic CriteriaAccess Queries: Dynamic CriteriaAccess Queries: JoinsAccess Queries: Advanced TypesAccess Queries: Action QueriesAccess Queries: Crosstab QueryAccess Queries: SQL Queries

db implementation - knukiyang/teaching/gdb/s20/... · 2020. 5. 7. · access queries: sort & filter...

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