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dimitr 2007-04-09 14:39:03 +00:00
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doc/sql.extensions/README.data_type_results_of_aggregations.txt
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@ -10,35 +10,32 @@ Syntax Rules:
1) Let DTS be the set of data types over which we must determine the final 1) Let DTS be the set of data types over which we must determine the final
result data type. result data type.
2) All of the data types in DTS shall be comparable. 2) All of the data types in DTS shall be comparable.
3) Case: 3) Case:
a) If any of the data types in DTS is character string, then: a) If any of the data types in DTS is character string, then:
1) If any of the data types in DTS is variable-length character string, 1) If all data types in DTS are fixed-length character strings, then the result
then the result data type is variable-length character string with is also a fixed-length character string, else a variable-length character
maximum length in characters equal to the maximum of the lengths in string. The resulting string length in characters is equal to the
characters and maximum lengths in characters of the data types in DTS. maximum of the lengths in characters of the data types in DTS.
2) Otherwise, the result data type is fixed-length character string with 2) The character set and collation are used from the first character string
length in characters equal to the maximum of the lengths in
characters of the data types in DTS.
3) The characterset/collation is used from the first character string
data type in DTS. data type in DTS.
b) If all of the data types in DTS are exact numeric, then the result data b) If all of the data types in DTS are exact numeric, then the result data
type is exact numeric with scale equal to the maximum of the scales of type is exact numeric with scale equal to the maximum of the scales of
the data types in DTS and the maximum precision of all data types in DTS. the data types in DTS and precision equal to the maximum precision of all
data types in DTS.
c) If any data type in DTS is approximate numeric, then each data type in DTS c) If any data type in DTS is approximate numeric, then each data type in DTS
shall be numeric else an error is thrown. shall be numeric, else an error is thrown.
d) If some data type in DTS is a datetime data type, then every data type in d) If some data type in DTS is a datetime data type, then every data type in
DTS shall be a datetime data type having the same datetime type. DTS shall be a datetime data type having the same datetime type,
else an error is thrown.
e) If any data type in DTS is BLOB, then each data type in DTS shall be e) If any data type in DTS is BLOB, then each data type in DTS shall be
BLOB and all with the same sub-type. BLOB and all with the same sub-type.