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......@@ -31867,24 +31867,9 @@ mysql> SELECT EXP(2);
mysql> SELECT EXP(-2);
-> 0.135335
@end example
@findex LN()
@item LN(X)
Returns the natural logarithm of @code{X}:
@example
mysql> SELECT LN(2);
-> 0.693147
mysql> SELECT LN(-2);
-> NULL
@end example
This function was added in MySQL version 4.0.3.
It is synonymous with @code{LOG(X)} in MySQL.
@findex LOG()
@item LOG([B,]X)
When called with one parameter, this function returns the natural logarithm
of @code{X}:
@item LOG(X)
Returns the natural logarithm of @code{X}:
@example
mysql> SELECT LOG(2);
-> 0.693147
......@@ -31892,33 +31877,7 @@ mysql> SELECT LOG(-2);
-> NULL
@end example
If you want the log of a number @code{X} to some arbitrary base @code{B}, use
When called with two parameters, this function returns the logarithm of
@code{X} for an arbitary base @code{B}:
@example
mysql> SELECT LOG(2,65536);
-> 16.000000
mysql> SELECT LOG(1,100);
-> NULL
@end example
The arbitrary base option was added in MySQL version 4.0.3.
@code{LOG(B,X)} is equivalent to @code{LOG(X)/LOG(B)}.
@findex LOG2()
@item LOG2(X)
Returns the base-2 logarithm of @code{X}:
@example
mysql> SELECT LOG2(65536);
-> 16.000000
mysql> SELECT LOG2(-100);
-> NULL
@end example
@code{LOG2()} is useful for finding out how many bits a number would
require for storage.
This function was added in MySQL version 4.0.3.
In earlier versions, you can use @code{LOG(X)/LOG(2)} instead.
the formula @code{LOG(X)/LOG(B)}.
@findex LOG10()
@item LOG10(X)
......@@ -49880,148 +49839,11 @@ Our TODO section contains what we plan to have in 4.0. @xref{TODO MySQL 4.0}.
@itemize @bullet
@item
Fixed a bug that made the pager option in the mysql client non-functional.
@end itemize
@item
Added full @code{AUTO_INCREMENT} support to @code{MERGE} tables.
Added OLAP functionality.
@c Arjen , please add the following text somewhere appropriate in the
text above:
-------------------------------------------------------------------------
Documentation for OLAP extension
Introduction
------------
MySQL will first support CUBE and ROLLUP operators from entire OLAP
functionality.
The CUBE and ROLLUP extensions to SQL make querying and reporting
easier in data warehousing environments. ROLLUP creates subtotals at
increasing levels of aggregation, from the most detailed up to a grand
total. CUBE is an extension similar to ROLLUP, enabling a single
statement to calculate all possible combinations of subtotals.
Syntax:
------
The syntax supported by the enhanced mysql for CUBE and ROLLUP
operators.
CUBE
----
SELECT field1, field2, ... AGGR(fieldn) FROM
table GROUP BY field1, field2 field(n-1) WITH CUBE
This would generate the aggregates with group bys of all the
combinations of dimensions.
ROLLUP:
-----
SELECT field1, field2, ... AGGR(fieldn) FROM table
GROUP BY field1, field2 field(n-1) WITH ROLLUP
Example:
-------
mysql> select * from sales;
+------------+---------------+------+--------+
| product | country | year | profit |
+------------+---------------+------+--------+
| Computer | India | 2000 | 1200 |
| TV | United States | 1999 | 150 |
| Calculator | United States | 1999 | 50 |
| Computer | United States | 1999 | 1500 |
| Computer | United States | 2000 | 1500 |
| TV | United States | 2000 | 150 |
| TV | India | 2000 | 100 |
| TV | India | 2000 | 100 |
| Calculator | United States | 2000 | 75 |
| Calculator | India | 2000 | 75 |
| TV | India | 1999 | 100 |
| Computer | India | 1999 | 1200 |
| Computer | United States | 2000 | 1500 |
| Calculator | United States | 2000 | 75 |
+------------+---------------+------+--------+
14 rows in set (0.00 sec)
mysql> Select sales.product, sales.country , sales.year, sum(profit) from
sales group by product, country, year with cube;
+------------+---------------+------+-------------+
| product | country | year | sum(profit) |
+------------+---------------+------+-------------+
| Calculator | India | 2000 | 75 |
| Calculator | United States | 1999 | 50 |
| Calculator | United States | 2000 | 150 |
| Computer | India | 1999 | 1200 |
| Computer | India | 2000 | 1200 |
| Computer | United States | 1999 | 1500 |
| Computer | United States | 2000 | 3000 |
| TV | India | 1999 | 100 |
| TV | India | 2000 | 200 |
| TV | United States | 1999 | 150 |
| TV | United States | 2000 | 150 |
| ALL | India | 1999 | 1300 |
| ALL | India | 2000 | 1475 |
| ALL | United States | 1999 | 1700 |
| ALL | United States | 2000 | 3300 |
| Calculator | ALL | 1999 | 50 |
| Calculator | ALL | 2000 | 225 |
| Computer | ALL | 1999 | 2700 |
| Computer | ALL | 2000 | 4200 |
| TV | ALL | 1999 | 250 |
| TV | ALL | 2000 | 350 |
| Calculator | India | 0 | 75 |
| Calculator | United States | 0 | 200 |
| Computer | India | 0 | 2400 |
| Computer | United States | 0 | 4500 |
| TV | India | 0 | 300 |
| TV | United States | 0 | 300 |
| ALL | ALL | 1999 | 3000 |
| ALL | ALL | 2000 | 4775 |
| ALL | India | 0 | 2775 |
| ALL | United States | 0 | 5000 |
| Calculator | ALL | 0 | 275 |
| Computer | ALL | 0 | 6900 |
| TV | ALL | 0 | 600 |
| ALL | ALL | 0 | 7775 |
+------------+---------------+------+-------------+
35 rows in set (0.00 sec)
MySQL supports now CUBE and ROLLUP extensions, with all functions
that one wishes to use with them.
Those extensions already work in all tested combinations. They work
with UNION's, should work with sub-selects in 4.1 and derived tables.
TODO
----
For the moment, ORDER and LIMIT are disabled for CUBE and ROLLUP. This
however remains to be added later.
Another feature that has to be added later is grouping of select list
itmes in order to alleviate user errors. For the moment, missing
(hidden) columns are not used at all.
Third feature to be done is to make SQL SET OPTION to set values for
all values of the column optionally to:
* ALL (as it is now)
* NULL
* blank
-------------------------------------------------------------------------
@item
Added support for @code{CUBE} and @code{ROLLUP}.
@end itemize
@node News-4.0.2, News-4.0.1, News-4.0.3, News-4.0.x
@appendixsubsec Changes in release 4.0.2 (01 July 2002)
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