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+#structure of tests;
+#1 test of table containing single unique blob column;
+#2 test of table containing another unique int/ varchar etc column;
+#3 test of table containing multiple unique blob column like unique(a),unique(b);
+#4 test of table containing multiple multiple unique blob column like unique(a,b...),unique(c,d....);
+#structure of each test;
+#test if update works;
+#test update for duplicate entry;
+#test update for no change keys;
+#test update for ignore ;
+#test 1
+create table t1 (a blob unique);
+show keys from t1;
+Table t1
+Non_unique 0
+Key_name a
+Seq_in_index 1
+Column_name a
+Collation A
+Cardinality NULL
+Sub_part NULL
+Packed NULL
+Null YES
+Index_type HASH
+Comment
+Index_comment
+insert into t1 values(1),(2),(3),(4),(5);
+select * from t1;
+a
+1
+2
+3
+4
+5
+update t1 set a=11 where a=5;
+update t1 set a=a+20 where a=1;
+select * from t1;
+a
+21
+2
+3
+4
+11
+update t1 set a=3 where a=2;
+ERROR 23000: Duplicate entry '3' for key 'a'
+update t1 set a=4 where a=3;
+ERROR 23000: Duplicate entry '4' for key 'a'
+#no change in blob key
+update t1 set a=3 where a=3;
+update t1 set a=2 where a=2;
+select* from t1;
+a
+21
+2
+3
+4
+11
+#IGNORE;
+update ignore t1 set a=3 where a=2;
+update ignore t1 set a=4 where a=3;
+select * from t1;
+a
+21
+2
+3
+4
+11
+drop table t1;
+#test 2;
+create table t1 (a int primary key, b blob unique , c int unique );
+show keys from t1;
+Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
+t1 0 PRIMARY 1 a A 0 NULL NULL BTREE
+t1 0 c 1 c A NULL NULL NULL YES BTREE
+t1 0 b 1 b A NULL NULL NULL YES HASH
+insert into t1 values(1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5),(6,6,6),(7,7,7);
+select * from t1 limit 3;
+a b c
+1 1 1
+2 2 2
+3 3 3
+update t1 set b=34 where a=1;
+update t1 set b=a+c+b+34 where b=2;
+update t1 set b=a+10+b where c=3;
+select * from t1;
+a b c
+1 34 1
+2 40 2
+3 16 3
+4 4 4
+5 5 5
+6 6 6
+7 7 7
+truncate table t1;
+insert into t1 values(1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5),(6,6,6),(7,7,7);
+update t1 set b=4 where a=3;
+ERROR 23000: Duplicate entry '4' for key 'b'
+update t1 set b=a+1 where b=3;
+ERROR 23000: Duplicate entry '4' for key 'b'
+update t1 set b=a+1 where c=3;
+ERROR 23000: Duplicate entry '4' for key 'b'
+#no change in blob key
+update t1 set b=3 where a=3;
+update t1 set b=2 where b=2;
+update t1 set b=5 where c=5;
+select* from t1;
+a b c
+1 1 1
+2 2 2
+3 3 3
+4 4 4
+5 5 5
+6 6 6
+7 7 7
+#IGNORE;
+update ignore t1 set b=3 where a=2;
+update ignore t1 set b=4 where b=3;
+update ignore t1 set b=5 where c=3;
+select * from t1;
+a b c
+1 1 1
+2 2 2
+3 3 3
+4 4 4
+5 5 5
+6 6 6
+7 7 7
+drop table t1;
+#test 3;
+create table t1 (a blob unique, b blob unique , c blob unique);
+show keys from t1;
+Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
+t1 0 a 1 a A NULL NULL NULL YES HASH
+t1 0 b 1 b A NULL NULL NULL YES HASH
+t1 0 c 1 c A NULL NULL NULL YES HASH
+insert into t1 values(1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5),(6,6,6),(7,7,7);
+select * from t1 limit 3;
+a b c
+1 1 1
+2 2 2
+3 3 3
+update t1 set b=34 where a=1;
+update t1 set b=a+c+b+34 where b=2;
+update t1 set b=a+10+b where c=3;
+select * from t1;
+a b c
+1 34 1
+2 40 2
+3 16 3
+4 4 4
+5 5 5
+6 6 6
+7 7 7
+truncate table t1;
+insert into t1 values(1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5),(6,6,6),(7,7,7);
+update t1 set b=4 where a=3;
+ERROR 23000: Duplicate entry '4' for key 'b'
+update t1 set b=a+1 where b=3;
+ERROR 23000: Duplicate entry '4' for key 'b'
+update t1 set b=a+1 where c=3;
+ERROR 23000: Duplicate entry '4' for key 'b'
+#no change in blob key
+update t1 set b=3 where a=3;
+update t1 set b=2 where b=2;
+update t1 set b=5 where c=5;
+select* from t1;
+a b c
+1 1 1
+2 2 2
+3 3 3
+4 4 4
+5 5 5
+6 6 6
+7 7 7
+#IGNORE;
+update ignore t1 set b=3 where a=2;
+update ignore t1 set b=4 where b=3;
+update ignore t1 set b=5 where c=3;
+update ignore t1 set b=b+3 where a>1 or b>1 or c>1;
+select * from t1;
+a b c
+1 1 1
+2 2 2
+3 3 3
+4 4 4
+5 8 5
+6 9 6
+7 10 7
+update ignore t1 set b=b+5 where a>1 and b<5 and c<a+b;
+select * from t1;
+a b c
+1 1 1
+2 7 2
+3 3 3
+4 4 4
+5 8 5
+6 9 6
+7 10 7
+drop table t1;
+#test 4 ultimate test;
+create table t1 (a int primary key , b int, c blob , d blob , e varchar(2000), f int , g text,
+unique (b,c), unique (b,f),unique(e,g),unique(a,b,c,d,e,f,g));
+desc t1;
+Field Type Null Key Default Extra
+a int(11) NO PRI NULL
+b int(11) YES MUL NULL
+c blob YES NULL
+d blob YES NULL
+e varchar(2000) YES MUL NULL
+f int(11) YES NULL
+g text YES NULL
+show create table t1;
+Table Create Table
+t1 CREATE TABLE `t1` (
+ `a` int(11) NOT NULL,
+ `b` int(11) DEFAULT NULL,
+ `c` blob DEFAULT NULL,
+ `d` blob DEFAULT NULL,
+ `e` varchar(2000) DEFAULT NULL,
+ `f` int(11) DEFAULT NULL,
+ `g` text DEFAULT NULL,
+ PRIMARY KEY (`a`),
+ UNIQUE KEY `b_2` (`b`,`f`),
+ UNIQUE KEY `b` (`b`,`c`) USING HASH,
+ UNIQUE KEY `e` (`e`,`g`) USING HASH,
+ UNIQUE KEY `a` (`a`,`b`,`c`,`d`,`e`,`f`,`g`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
+t1 0 PRIMARY 1 a A 0 NULL NULL BTREE
+t1 0 b_2 1 b A NULL NULL NULL YES BTREE
+t1 0 b_2 2 f A NULL NULL NULL YES BTREE
+t1 0 b 1 b A NULL NULL NULL YES HASH
+t1 0 b 2 c A NULL NULL NULL YES HASH
+t1 0 e 1 e A NULL NULL NULL YES HASH
+t1 0 e 2 g A NULL NULL NULL YES HASH
+t1 0 a 1 a A NULL NULL NULL HASH
+t1 0 a 2 b A NULL NULL NULL YES HASH
+t1 0 a 3 c A NULL NULL NULL YES HASH
+t1 0 a 4 d A NULL NULL NULL YES HASH
+t1 0 a 5 e A NULL NULL NULL YES HASH
+t1 0 a 6 f A NULL NULL NULL YES HASH
+t1 0 a 7 g A NULL NULL NULL YES HASH
+insert into t1 values(1,1,1,1,1,1,1),(2,2,2,2,2,2,2),(3,3,3,3,3,3,3),(4,4,4,4,4,4,4),
+(5,5,5,5,5,5,5),(6,6,6,6,6,6,6),(7,7,7,7,7,7,7),(8,8,8,8,8,8,8),(9,9,9,9,9,9,9);
+select * from t1 limit 3;
+a b c d e f g
+1 1 1 1 1 1 1
+2 2 2 2 2 2 2
+3 3 3 3 3 3 3
+#key b_c
+update t1 set b=2 ,c=2 where a=1;
+ERROR 23000: Duplicate entry '2-2' for key 'b'
+update t1 set b=b+34, c=c+34 where e=1 and g=1 ;
+update t1 set b=35, c=35 where e=1 and g=1 ;
+update t1 set b=b+1, c=c+1 where a>0;
+ERROR 23000: Duplicate entry '3-3' for key 'b'
+update ignore t1 set b=b+1, c=c+1 where a>0;
+select * from t1 ;
+a b c d e f g
+1 37 37 1 1 1 1
+2 2 2 2 2 2 2
+3 3 3 3 3 3 3
+4 4 4 4 4 4 4
+5 5 5 5 5 5 5
+6 6 6 6 6 6 6
+7 7 7 7 7 7 7
+8 8 8 8 8 8 8
+9 10 10 9 9 9 9
+truncate table t1;
+insert into t1 values(1,1,1,1,1,1,1),(2,2,2,2,2,2,2),(3,3,3,3,3,3,3),(4,4,4,4,4,4,4),
+(5,5,5,5,5,5,5),(6,6,6,6,6,6,6),(7,7,7,7,7,7,7),(8,8,8,8,8,8,8),(9,9,9,9,9,9,9);
+#key b_f no hash key
+update t1 set b=2 , f=2 where a=1;
+ERROR 23000: Duplicate entry '2-2' for key 'b_2'
+update t1 set b=b+33, f=f+33 where e=1 and g=1;
+update t1 set b=34, f=34 where e=1 and g=1 ;
+update t1 set b=b+1, f=f+1 where a>0;
+ERROR 23000: Duplicate entry '3-3' for key 'b_2'
+update ignore t1 set b=b+1, f=f+1 where a>0;
+select * from t1 ;
+a b c d e f g
+1 36 1 1 1 36 1
+2 2 2 2 2 2 2
+3 3 3 3 3 3 3
+4 4 4 4 4 4 4
+5 5 5 5 5 5 5
+6 6 6 6 6 6 6
+7 7 7 7 7 7 7
+8 8 8 8 8 8 8
+9 10 9 9 9 10 9
+truncate table t1;
+insert into t1 values(1,1,1,1,1,1,1),(2,2,2,2,2,2,2),(3,3,3,3,3,3,3),(4,4,4,4,4,4,4),
+(5,5,5,5,5,5,5),(6,6,6,6,6,6,6),(7,7,7,7,7,7,7),(8,8,8,8,8,8,8),(9,9,9,9,9,9,9);
+#key e_g
+update t1 set e=2 , g=2 where a=1;
+ERROR 23000: Duplicate entry '2-2' for key 'e'
+update t1 set e=e+34, g=g+34 where a=1;
+update t1 set e=34, g=34 where e=1 and g=1 ;
+select * from t1 where a=1;
+a b c d e f g
+1 1 1 1 35 1 35
+update t1 set e=e+1, g=g+1 where a>0;
+ERROR 23000: Duplicate entry '3-3' for key 'e'
+update ignore t1 set e=e+1, g=g+1 where a>0;
+select * from t1 ;
+a b c d e f g
+1 1 1 1 37 1 37
+2 2 2 2 2 2 2
+3 3 3 3 3 3 3
+4 4 4 4 4 4 4
+5 5 5 5 5 5 5
+6 6 6 6 6 6 6
+7 7 7 7 7 7 7
+8 8 8 8 8 8 8
+9 9 9 9 10 9 10
+drop table t1;
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