MELJUN CORTES Query (SQL)

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MELJUN CORTES Query (SQL)

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MELJUN CORTES Query (SQL)

  1. 1. Querying the DatabaseMELJUN CORTES
  2. 2. QUERY A question represented in a way the OO.Org Base can understand Are used to find more item one record, let you specify the field you want to see in the Data sheet To access only a subset of your data that can be well defined by a filter condition
  3. 3. Dynaset Is the set of records resulting from a query or filter When you edit records in a dynaset, you are actually editing the records in the original table
  4. 4. Creating Query usingDesign View Open the database file where you want to create the new query Select Queries object/icon from Database Pane Click Create Query in Design View Run the query (use Run button)
  5. 5. Querying with TextExact text dataExamples:  Pop (or Pop)  Pasig (or Pasig) Using Wildcards  Symbols that represent any character or combination or characters
  6. 6. Wildcards(or wildcard characters) Asterisk (*) – represents any collection of charactersExample: R*TResult : RT, RAT, RENT, RESET Question Mark (?) – represents any individual characterExample: R?TResult : RAT, ROT, RIT, RUT
  7. 7. Querying with Numbers Exact numerical value Default, assumed to be equal to value indicatedOPERATOR – is a sign or symbol that specifies the type of calculation to perform within an expression Other comparison operators > greater than < less than >= greater than or equal <= less than or equal NOT not equal to BETWEEN ___ AND ____
  8. 8. Criterion Are used to select records in queries and filters Is a set of conditions that must be matched in order for a record to be included in a dynaset
  9. 9. Compound Criteria AND Conditional QueryPlace criteria on the same line(Use CRITERIA row of the design grid) OR Conditional QueryPlace criteria on separate lines(Use CRITERIA and OR rows of the design grid)
  10. 10. Expression Are used to specify criteria in queries perform updates in an action query Is any combination of mathematical or logical operators, constants, functions, names of fields and properties that evaluates to a single value
  11. 11. JOINING TABLES Select the tables to bring out the field lists at the upper pane of the Select Query window Access will draw a line, called join line, between matching fields in the two tables Select fields either the tables, enter criteria, run query Access will join the tables automatically
  12. 12. Sorting Data in a Query Sort key – field or fields on which the records are sorted Primary sort key (or major key) – more important key when sorting on more than one field Secondary sort key (or minor key) Specify sort order in the SORT line of the design grid, e.g., sort key on the left will be the major sort key)

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