[ask]SQL command act like sort and grep Post: 302716629

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Top Forums Programming [ask]SQL command act like sort and grep Post 302716629 by gary_w on Tuesday 16th of October 2012 04:56:55 PM

10-16-2012

Registered User

Have a look at this. Using union merges the queries together and sorts them. Logically this is not what you asked for though. Your example was getting a row on either side of the target value. This example gets the next highest and next lowest value relative to the target value. By definition the order of rows do not matter in a relational database table, so one would not really select a row on either side of a value in practice. Hopefully someone with better SQL skills can make this more efficient.

Code:

SQL> create table test (
  2  idx number);

Table created.

SQL> insert into test values (234234);

1 row created.

SQL> insert into test values (54654);

1 row created.

SQL> insert into test values (123134);

1 row created.

SQL> insert into test values (467456);

1 row created.

SQL> insert into test values (24234234);

1 row created.

SQL> insert into test values (7867867);

1 row created.

SQL> insert into test values (23424);

1 row created.

SQL> insert into test values (568567);

1 row created.

SQL> ed
Wrote file afiedt.buf

  1  select idx
  2  from test
  3  where idx=467456
  4  union
  5  select max(idx)
  6  from test
  7  where idx < 467456
  8  union
  9  select min(idx)
 10  from test
 11* where idx > 467456
SQL> /

       IDX
----------
    234234
    467456
    568567

SQL>

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LEARN ABOUT PHP

mssql_query

MSSQL_QUERY(3)															    MSSQL_QUERY(3)

mssql_query - Send MS SQL query

SYNOPSIS

       mixed mssql_query (string  $query, [resource  $link_identifier], [int  $batch_size])

DESCRIPTION

       mssql_query(3) sends a query to the currently active database on the server that's associated with the specified link identifier.

PARAMETERS

	      o $query
		- An SQL query.

	      o $link_identifier
		-  A  MS SQL link identifier, returned by mssql_connect(3) or mssql_pconnect(3).  If the link identifier isn't specified, the last
		opened link is assumed. If no link is open, the function tries to establish a link as if mssql_connect(3) was called, and use it.

	      o $batch_size
		- The number of records to batch in the buffer.

RETURN VALUES

	Returns a MS SQL result resource on success, TRUE if no rows were returned, or FALSE on error.

EXAMPLES

       Example #1

	      mssql_query(3) example

	      <?php
	      // Connect to MSSQL
	      $link = mssql_connect('KALLESPCSQLEXPRESS', 'sa', 'phpfi');

	      if (!$link || !mssql_select_db('php', $link)) {
		  die('Unable to connect or select database!');
	      }

	      // Do a simple query, select the version of
	      // MSSQL and print it.
	      $version = mssql_query('SELECT @@VERSION');
	      $row = mssql_fetch_array($version);

	      echo $row[0];

	      // Clean up
	      mssql_free_result($version);
	      ?>

NOTES

       Note

	       If the query returns multiple results then it is necessary to fetch all results by mssql_next_result(3)	or  free  the  results	by
	      mssql_free_result(3) before executing next query.

SEE ALSO

       mssql_select_db(3), mssql_connect(3).

PHP Documentation Group 													    MSSQL_QUERY(3)

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