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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;
affected rows: 0
info: Records: 0 Duplicates: 0 Warnings: 0
set @old_sql_mode = @@sql_mode;
set @@sql_mode = 'STRICT_TRANS_TABLES';
ALTER TABLE t MODIFY c3 INT NOT NULL, ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0 Duplicates: 0 Warnings: 0
set @@sql_mode = @old_sql_mode;
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
connect con1,localhost,root,,;
connection con1;
SET SQL_MODE='STRICT_ALL_TABLES';
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
connection default;
ALTER TABLE t MODIFY c2 INT, ALGORITHM=INPLACE;
connection con1;
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
disconnect con1;
connection default;
ALTER TABLE t MODIFY c2 INT NULL, ALGORITHM=INPLACE;
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES
WHERE NAME='test/t';
TABLE_ID NAME FLAG N_COLS SPACE ROW_FORMAT ZIP_PAGE_SIZE SPACE_TYPE
# test/t 33 6 # Dynamic 0 Single
DROP TABLE t;
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