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into rurik.mysql.com:/home/igor/dev/mysql-5.0-0 BitKeeper/deleted/.del-errmsg.txt~31abf77f9e7b9211: Auto merged BitKeeper/deleted/.del-sql_state.h~4307ea5f1fe99019: Auto merged mysql-test/r/explain.result: Auto merged mysql-test/r/key_cache.result: Auto merged mysql-test/r/preload.result: Auto merged mysql-test/t/explain.test: Auto merged mysql-test/t/select.test: Auto merged scripts/make_win_src_distribution.sh: Auto merged sql/sql_base.cc: Auto merged BitKeeper/deleted/.del-errmsg.txt~11edc4db89248c16: Manual merge BitKeeper/deleted/.del-errmsg.txt~184eb1f09242dc72: Manual merge BitKeeper/deleted/.del-errmsg.txt~2cdeb8d6f80eba72: Manual merge BitKeeper/deleted/.del-errmsg.txt~4617575065d612b9: Manual merge BitKeeper/deleted/.del-errmsg.txt~587903f9311db2d1: Manual merge BitKeeper/deleted/.del-errmsg.txt~606dfaeb9e81aa4e: Manual merge BitKeeper/deleted/.del-errmsg.txt~6bbd9eac7f0e6b89: Manual merge BitKeeper/deleted/.del-errmsg.txt~7397c423c52c6d2c: Manual merge BitKeeper/deleted/.del-errmsg.txt~898865062c970766: Manual merge BitKeeper/deleted/.del-errmsg.txt~8ed1999cbd481dc4: Manual merge BitKeeper/deleted/.del-errmsg.txt~94a93cc742fca24d: Manual merge BitKeeper/deleted/.del-errmsg.txt~9dab24f7fb11b1e1: Manual merge BitKeeper/deleted/.del-errmsg.txt~b44a85a177954da0: Manual merge BitKeeper/deleted/.del-errmsg.txt~b6181e29d8282b06: Manual merge BitKeeper/deleted/.del-errmsg.txt~ba132dc9bc936c8a: Manual merge BitKeeper/deleted/.del-errmsg.txt~e2609fdf7870795: Manual merge BitKeeper/deleted/.del-errmsg.txt~e3183b99fbba0a9c: Manual merge BitKeeper/deleted/.del-errmsg.txt~eeb2c47537ed9c23: Manual merge BitKeeper/deleted/.del-errmsg.txt~ef28b592c7591b7: Manual merge BitKeeper/deleted/.del-errmsg.txt~ef53c33ac0ff8a84: Manual merge BitKeeper/deleted/.del-errmsg.txt~f19bfd5d4c918964: Manual merge BitKeeper/deleted/.del-errmsg.txt~f96b7055cac394e: Manual merge BitKeeper/deleted/.del-errmsg.txt~ffe4a0c9e3206150: Manual merge BitKeeper/deleted/.del-mysqld_error.h~9dac75782467aab7: Manual merge
59 lines
2.6 KiB
Text
59 lines
2.6 KiB
Text
drop table if exists t1;
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create table t1 (id int not null, str char(10), unique(str));
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explain select * 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 0 const row not found
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insert into t1 values (1, null),(2, null),(3, "foo"),(4, "bar");
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select * from t1 where str is null;
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id str
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1 NULL
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2 NULL
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select * from t1 where str="foo";
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id str
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3 foo
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explain select * from t1 where str is null;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref str str 11 const 1 Using where
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explain select * from t1 where str="foo";
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 const str str 11 const 1
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explain select * from t1 ignore key (str) where str="foo";
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 4 Using where
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explain select * from t1 use key (str,str) where str="foo";
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 const str str 11 const 1
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explain select * from t1 use key (str,str,foo) where str="foo";
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ERROR HY000: Key 'foo' doesn't exist in table 't1'
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explain select * from t1 ignore key (str,str,foo) where str="foo";
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ERROR HY000: Key 'foo' doesn't exist in table 't1'
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drop table t1;
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explain select 1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used
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create table t1 (a int not null);
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explain select count(*) 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 NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
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insert into t1 values(1);
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explain select count(*) 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 NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
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insert into t1 values(1);
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explain select count(*) 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 NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
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drop table t1;
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set names koi8r;
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create table <20><><EFBFBD> (<28><><EFBFBD>0 int, <20><><EFBFBD>1 int, key <20><><EFBFBD>0 (<28><><EFBFBD>0), key <20><><EFBFBD>01 (<28><><EFBFBD>0,<2C><><EFBFBD>1));
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insert into <20><><EFBFBD> (<28><><EFBFBD>0) values (1);
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insert into <20><><EFBFBD> (<28><><EFBFBD>0) values (2);
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explain select <20><><EFBFBD>0 from <20><><EFBFBD> where <20><><EFBFBD>0=1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE <09><><EFBFBD> ref <09><><EFBFBD>0,<2C><><EFBFBD>01 <09><><EFBFBD>0 5 const 1 Using where; Using index
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drop table <20><><EFBFBD>;
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set names latin1;
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select 3 into @v1;
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explain select 3 into @v1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE NULL NULL NULL NULL NULL NULL NULL No tables used
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