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22 lines
1.1 KiB
Text
22 lines
1.1 KiB
Text
#
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# Testing of NULL in a lot of different places
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#
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select null,\N,isnull(null),isnull(1/0),isnull(1/0 = null),ifnull(null,1),ifnull(null,"TRUE"),ifnull("TRUE","ERROR"),1/0 is null,1 is not null;
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select 1 | NULL,1 & NULL,1+NULL,1-NULL;
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select NULL=NULL,NULL<>NULL,IFNULL(NULL,1.1)+0,IFNULL(NULL,1) | 0;
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select strcmp("a",NULL),(1<NULL)+0.0,NULL regexp "a",null like "a%","a%" like null;
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select concat("a",NULL),replace(NULL,"a","b"),replace("string","i",NULL),replace("string",NULL,"i"),insert("abc",1,1,NULL),left(NULL,1);
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select repeat("a",0),repeat("ab",5+5),repeat("ab",-1),reverse(NULL);
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select field(NULL,"a","b","c");
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select 2 between null and 1,2 between 3 AND NULL,NULL between 1 and 2,2 between NULL and 3, 2 between 1 AND null;
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SELECT NULL AND NULL, 1 AND NULL, NULL AND 1, NULL OR NULL, 0 OR NULL, NULL OR 0;
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SELECT (NULL OR NULL) IS NULL;
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select NULL AND 0, 0 and NULL;
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select inet_ntoa(null),inet_aton(null),inet_aton("122.256"),inet_aton("122.226."),inet_aton("");
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drop table if exists t1;
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create table t1 (x int);
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insert into t1 values (null);
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select * from t1 where x != 0;
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drop table t1;
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