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https://git.postgresql.org/git/postgresql.git
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49 lines
1.4 KiB
MySQL
49 lines
1.4 KiB
MySQL
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-- xid and xid8
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-- values in range, in octal, decimal, hex
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select '010'::xid,
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'42'::xid,
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'0xffffffff'::xid,
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'-1'::xid,
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'010'::xid8,
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'42'::xid8,
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'0xffffffffffffffff'::xid8,
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'-1'::xid8;
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-- garbage values are not yet rejected (perhaps they should be)
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select ''::xid;
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select 'asdf'::xid;
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select ''::xid8;
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select 'asdf'::xid8;
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-- equality
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select '1'::xid = '1'::xid;
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select '1'::xid != '1'::xid;
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select '1'::xid8 = '1'::xid8;
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select '1'::xid8 != '1'::xid8;
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-- conversion
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select '1'::xid = '1'::xid8::xid;
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select '1'::xid != '1'::xid8::xid;
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-- we don't want relational operators for xid, due to use of modular arithmetic
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select '1'::xid < '2'::xid;
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select '1'::xid <= '2'::xid;
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select '1'::xid > '2'::xid;
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select '1'::xid >= '2'::xid;
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-- we want them for xid8 though
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select '1'::xid8 < '2'::xid8, '2'::xid8 < '2'::xid8, '2'::xid8 < '1'::xid8;
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select '1'::xid8 <= '2'::xid8, '2'::xid8 <= '2'::xid8, '2'::xid8 <= '1'::xid8;
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select '1'::xid8 > '2'::xid8, '2'::xid8 > '2'::xid8, '2'::xid8 > '1'::xid8;
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select '1'::xid8 >= '2'::xid8, '2'::xid8 >= '2'::xid8, '2'::xid8 >= '1'::xid8;
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-- we also have a 3way compare for btrees
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select xid8cmp('1', '2'), xid8cmp('2', '2'), xid8cmp('2', '1');
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-- xid8 has btree and hash opclasses
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create table xid8_t1 (x xid8);
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create index on xid8_t1 using btree(x);
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create index on xid8_t1 using hash(x);
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drop table xid8_t1;
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