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The ORDER BY Clause
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[ ORDER BY expression [ ASC | DESC | USING operator ] [,] ]
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As seen in 6, the ORDER BY clause is used to sort the result set based on one or more column values One or more expression parameters are used to define the column (or columns) used to order the result set records If two records have the same value for the first expression listed, the next expression is compared, and so on By default, the ORDER BY clause orders records in ascending order, either numerically if the expression column is a numeric data type, or using the locale-specific string sorting if the column is a string data type The USING parameter declares an alternative operator to use for ordering The less-than operator (<) is equivalent to the ASC keyword, and the greater-than operator (>) is equivalent to the DESC keyword
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The LIMIT Clause
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[ LIMIT ( count | ALL ) ] [ OFFSET start ]
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The LIMIT clause specifies a maximum number of records to return in the result set For queries that may produce a large number of records, this is used to help manage the output The default behavior is LIMIT ALL, which returns all records in the result set When you specify a value for count, the output only displays count records The OFFSET parameter allows you to specify the number of result set records to skip before displaying records in the output Be careful with this parameter It is easy to get confused with the orientation of the start value The first record in the result set is at start value 0 (no records are skipped), not 1 Start value 1 is the second record in the result set (one record is skipped) This can cause a problem if you are not careful The OFFSET parameter goes hand-in-hand with the LIMIT clause If you limit the output to ten records, you can rerun the query with start equal to 10 (remember, skip the first ten records), so the output starts where the previous output ended Using the LIMIT clause on a query may produce inconsistent results, as by default there is no ordering to the records returned in the result set It is advised that you use the ORDER BY clause whenever you use the LIMIT clause to ensure the output is sorted into a specific order:
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test=> select * from store"Customer" order by "CustomerID" limit 3 offset 0; CustomerID | LastName | FirstName | Address | City |State| Zip | Phone + + + + + + + BLU001 | Blum | Rich | 123 Main |Chicago| IL |60633|555-1234 BLU002 | Blum | Barbara | 879 Oak | Gary | IN |46100|555-4321 BLU003 | Blum | Katie | 342 Pine |Hammond| IN |46200|555-9242 (3 rows) test=> select * from store"Customer" order by "CustomerID" limit 3 offset 3; CustomerID | LastName | FirstName | Address | City |State| Zip | Phone + + + + + + + BLU004 | Blum | Jessica |925 Dogwood| Gary | IN |46100|555-3241 (1 row) test=>
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When using the LIMIT and OFFSET parameters, you must be careful that you do not overlap the records in the listing
The FOR Clause
[ FOR (UPDATE | SHARE ) [ OF table_name [,] [ NOWAIT ] ]
By default, the SELECT command does not lock any records during its operation The FOR clause allows you to change that behavior It is not uncommon during a transaction (discussed later in this chapter) to perform a SELECT command to obtain the current data values, then immediately perform an INSERT, DELETE, or UPDATE command to alter the values in the database Between those operations, you may not want the current values to be changed by other database users This is where the FOR clause comes in The FOR UPDATE clause causes the records returned in the result set to be locked in the table This prevents other users from viewing, deleting, or modifying any record returned in the result set until the transaction that contains the SELECT command finishes Using the FOR UPDATE clause causes the SELECT command to wait until any other table locks set by other users are completed If you specify the NOWAIT parameter, the SELECT command does not wait, but instead exits with an error stating that the records are locked The FOR SHARE clause behaves similarly to the FOR UPDATE clause, except it allows other users to view the records while they are locked However, they will not be able to delete or modify any of the records By default, the FOR clause locks all records that are returned in the result set If you do not want to lock all of the records returned in the result set, you combine the FOR clause with the LIMIT clause to limit the number of records locked in the transaction
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