53 lines
1.7 KiB
Plaintext
53 lines
1.7 KiB
Plaintext
CREATE TABLE t (c1 INT PRIMARY KEY, c2 INT NOT NULL, c3 INT) ENGINE=InnoDB;
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INSERT INTO t VALUES (1,2,3),(4,5,6),(7,8,9);
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ALTER TABLE t CHANGE c1 c1 INT NULL FIRST, ALGORITHM=INPLACE;
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ERROR 42000: All parts of a PRIMARY KEY must be NOT NULL; if you need NULL in a key, use UNIQUE instead
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ALTER TABLE t MODIFY c3 INT NOT NULL, ALGORITHM=INPLACE;
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affected rows: 0
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info: Records: 0 Duplicates: 0 Warnings: 0
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ALTER TABLE t CHANGE c2 c2 INT, CHANGE c2 c2 INT NOT NULL;
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ERROR 42S22: Unknown column 'c2' in 't'
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ALTER TABLE t MODIFY c2 INT, MODIFY c2 INT NOT NULL;
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ERROR 42S22: Unknown column 'c2' in 't'
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ALTER TABLE t MODIFY c2 INT UNSIGNED, MODIFY c2 INT;
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ERROR 42S22: Unknown column 'c2' in 't'
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ALTER TABLE t MODIFY c2 CHAR(1) NOT NULL, MODIFY c2 INT NOT NULL;
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ERROR 42S22: Unknown column 'c2' in 't'
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ALTER TABLE t CHANGE c2 c2 INT NOT NULL;
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affected rows: 0
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info: Records: 0 Duplicates: 0 Warnings: 0
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ALTER TABLE t MODIFY c2 INT NOT NULL;
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affected rows: 0
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info: Records: 0 Duplicates: 0 Warnings: 0
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UPDATE t SET c2=NULL;
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ERROR 23000: Column 'c2' cannot be null
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SELECT * FROM t;
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c1 c2 c3
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1 2 3
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4 5 6
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7 8 9
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ALTER TABLE t MODIFY c2 INT, ALGORITHM=INPLACE;
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BEGIN;
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UPDATE t SET c2=NULL;
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SELECT * FROM t;
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c1 c2 c3
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1 NULL 3
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4 NULL 6
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7 NULL 9
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ROLLBACK;
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SELECT * FROM t;
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c1 c2 c3
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1 2 3
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4 5 6
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7 8 9
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ALTER TABLE t MODIFY c2 INT NULL, ALGORITHM=INPLACE;
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SELECT * FROM INFORMATION_SCHEMA.INNODB_TABLES
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WHERE NAME='test/t';
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TABLE_ID NAME FLAG N_COLS SPACE ROW_FORMAT ZIP_PAGE_SIZE SPACE_TYPE INSTANT_COLS
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# test/t 33 9 # Dynamic 0 Single 0
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DROP TABLE t;
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CREATE TABLE t1(c1 INT);
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ALTER TABLE t1 ADD CONSTRAINT UNIQUE KEY i1(c1);
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ALTER TABLE t1 CHANGE c1 c1 INT SIGNED NOT NULL,ADD KEY(c1);
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DROP TABLE t1;
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