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19 lines
986 B
Plaintext
19 lines
986 B
Plaintext
drop table if exists t1,t2;
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create table t1(str varchar(10) default 'def',strnull varchar(10),intg int default '10',rel double default '3.14');
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insert into t1 values ('','',0,0.0);
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select default(str), default(strnull), default(intg), default(rel) from t1;
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default(str) default(strnull) default(intg) default(rel)
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def NULL 10 3.14
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explain extended select default(str), default(strnull), default(intg), default(rel) from t1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 system NULL NULL NULL NULL 1
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Warnings:
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Note 1003 select default(test.t1.str) AS `default(str)`,default(test.t1.strnull) AS `default(strnull)`,default(test.t1.intg) AS `default(intg)`,default(test.t1.rel) AS `default(rel)` from test.t1
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select * from t1 where str <> default(str);
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str strnull intg rel
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0 0
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explain select * from t1 where str <> default(str);
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 system NULL NULL NULL NULL 1
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drop table t1;
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