MonetDB type system

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Revision as of 18:39, 6 October 2015 by Stefan Manegold (talk | contribs)
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  • Rule #1
    • monetdb_config.h must be the first #include in each .c file (not in any .h file).
  • Rule #2
    • C types long & unsigned long are evil and must NOT be used; while they are 32/64-bit on 32/64-bit systems under Unix, they are always 32-bit (also on 64-bit systems) under Windows.
MonetDB type system
semantics SQL MAL C width
[byte] ([bit])
signed? NIL value min value max value format string format cast availability C example
1-byte (8-bit)
signed integer
TINYINT :bte bte 1 (8) yes -128 -127 127 "%hhd" always bte x = 0;
printf("%hhd", x);
2-byte (16-bit)
signed integer
SMALLINT :sht sht 2 (16) yes -65536 -65535 65535 "%hd" always sht x = 0;
printf( "%hd", x);
4-byte (32-bit)
signed integer
INT / INTEGER :int int 4 (32) yes -2147483648 -2147483647 2147483647 "%d" always int x = 0;
printf( "%d", x);
8-byte (64-bit)
signed integer
BIGINT :lng lng 8 (64) yes -9223372036854775808 -9223372036854775807 9223372036854775807 LLFMT always lng x = 0;
printf(LLFMT , x);
16-byte (128-bit)
signed integer
HUGEINT :hge hge 16 (128) yes -170141183460469231731687303715884105728 -170141183460469231731687303715884105727 170141183460469231731687303715884105727 (none provide by compilers) if supported by compiler
(configure then defines HAVE_HGE)
#ifdef HAVE_HGE
hge x = 0;
printf("%.40g", (dbl) x);
#endif

... to be continued ...