1
DROP TABLE IF EXISTS t7;
2
CREATE TABLE t7(c1 ENUM('a','abcdefghijabcdefghijabcdefghijabcdefghijabcdefghij') NULL);
3
INSERT INTO t7(c1) VALUES(NULL);
4
INSERT INTO t7(c1) VALUES('');
6
Warning 1265 Data truncated for column 'c1' at row 1
7
INSERT INTO t7(c1) VALUES('a');
8
INSERT INTO t7(c1) VALUES('abcdefghijabcdefghijabcdefghijabcdefghijabcdefghij');
9
INSERT INTO t7(c1) VALUES('abcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghij');
11
Warning 1265 Data truncated for column 'c1' at row 1
17
abcdefghijabcdefghijabcdefghijabcdefghijabcdefghij
19
SELECT COUNT(c1) AS null_rows FROM t7 WHERE c1 IS NULL;