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