93 lines
3.0 KiB
Plaintext
93 lines
3.0 KiB
Plaintext
drop table if exists t1;
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CREATE TABLE t1 (a INT DEFAULT 0, b INT, PRIMARY KEY ka(a)) ENGINE=XEngine;
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INSERT INTO t1 (a, b) VALUES (1, 5);
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INSERT INTO t1 (a, b) VALUES (2, 6);
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INSERT INTO t1 (a, b) VALUES (3, 7);
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INSERT INTO t1 (a,b) VALUES (4,5);
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ALTER TABLE t1 ADD UNIQUE INDEX kb(b), ALGORITHM=INPLACE;
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ERROR 23000: Duplicate entry '5' for key 'kb'
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SHOW CREATE TABLE t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` int(11) NOT NULL DEFAULT '0',
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`b` int(11) DEFAULT NULL,
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PRIMARY KEY (`a`)
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) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
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DROP TABLE t1;
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CREATE TABLE t1 (a INT DEFAULT 0, b INT, PRIMARY KEY ka(a)) ENGINE=XEngine;
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INSERT INTO t1 (a, b) VALUES (1, 5);
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INSERT INTO t1 (a, b) VALUES (2, 6);
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INSERT INTO t1 (a, b) VALUES (3, 7);
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ALTER TABLE t1 ADD UNIQUE INDEX kb(b), ALGORITHM=INPLACE;
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INSERT INTO t1 (a,b) VALUES (4,5);
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ERROR 23000: Duplicate entry '5' for key 'kb'
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INSERT INTO t1 (a,b) VALUES (5,8);
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SHOW CREATE TABLE t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` int(11) NOT NULL DEFAULT '0',
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`b` int(11) DEFAULT NULL,
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PRIMARY KEY (`a`),
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UNIQUE KEY `kb` (`b`)
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) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
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SELECT * FROM t1 FORCE INDEX(kb);
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a b
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1 5
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2 6
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3 7
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5 8
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DROP TABLE t1;
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CREATE TABLE t1 (a INT DEFAULT 0, b INT, PRIMARY KEY ka(a)) ENGINE=XEngine;
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INSERT INTO t1 (a, b) VALUES (1, 5);
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INSERT INTO t1 (a, b) VALUES (2, NULL);
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INSERT INTO t1 (a, b) VALUES (3, NULL);
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ALTER TABLE t1 ADD UNIQUE INDEX kb(b), ALGORITHM=INPLACE;
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INSERT INTO t1 (a, b) VALUES (4, NULL);
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SHOW CREATE TABLE t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` int(11) NOT NULL DEFAULT '0',
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`b` int(11) DEFAULT NULL,
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PRIMARY KEY (`a`),
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UNIQUE KEY `kb` (`b`)
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) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
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SELECT COUNT(*) FROM t1 FORCE INDEX(kb);
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COUNT(*)
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4
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DROP TABLE t1;
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CREATE TABLE t1 (a INT DEFAULT 0, b INT, c INT, PRIMARY KEY ka(a)) ENGINE=XEngine;
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INSERT INTO t1 (a,b,c) VALUES (1,1,NULL);
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INSERT INTO t1 (a,b,c) VALUES (2,1,NULL);
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INSERT INTO t1 (a,b,c) VALUES (3,1,NULL);
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INSERT INTO t1 (a,b,c) VALUES (4,1,5);
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ALTER TABLE t1 ADD UNIQUE INDEX kbc(b,c), ALGORITHM=INPLACE;
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SHOW CREATE TABLE t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` int(11) NOT NULL DEFAULT '0',
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`b` int(11) DEFAULT NULL,
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`c` int(11) DEFAULT NULL,
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PRIMARY KEY (`a`),
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UNIQUE KEY `kbc` (`b`,`c`)
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) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
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SELECT COUNT(*) FROM t1 FORCE INDEX(kbc);
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COUNT(*)
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4
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DROP TABLE t1;
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CREATE TABLE t1 (a INT, b INT) ENGINE=XEngine;
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INSERT INTO t1 (a, b) VALUES (1, 5);
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INSERT INTO t1 (a, b) VALUES (2, 6);
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INSERT INTO t1 (a, b) VALUES (3, 7);
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ALTER TABLE t1 ADD UNIQUE INDEX kb(b);
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INSERT INTO t1 (a, b) VALUES (4, 8);
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INSERT INTO t1 (a, b) VALUES (5, 5);
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ERROR 23000: Duplicate entry '5' for key 'kb'
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SHOW CREATE TABLE t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` int(11) DEFAULT NULL,
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`b` int(11) DEFAULT NULL,
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UNIQUE KEY `kb` (`b`)
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) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
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DROP TABLE t1;
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