1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
CREATE TABLE t_8114 (a int) ENGINE = INNODB;
ALTER TABLE t_8114 ADD b INT GENERATED ALWAYS AS (a) VIRTUAL;
SELECT NAME FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES WHERE NAME LIKE "%t_8114";
NAME
test/t_8114
SELECT NAME, POS, MTYPE, PRTYPE, LEN FROM INFORMATION_SCHEMA.INNODB_SYS_COLUMNS WHERE TABLE_ID IN (SELECT TABLE_ID FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES WHERE NAME LIKE "%t_8114");
NAME POS MTYPE PRTYPE LEN
a 0 6 1027 4
b 65537 6 9219 4
INSERT INTO t_8114 VALUES (9, default);
INSERT INTO t_8114 VALUES (3, default);
INSERT INTO t_8114 VALUES (1, default);
INSERT INTO t_8114 VALUES (5, default);
SELECT * FROM t_8114;
a b
9 9
3 3
1 1
5 5
DROP TABLE t_8114;
CREATE TABLE t_8114 (Column_1 CHAR(5) GENERATED ALWAYS AS (PI()+5), Column_2 CHAR(5)) engine=innodb;
SELECT NAME, FLAG, N_COLS FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES WHERE NAME LIKE "%t_8114";
NAME FLAG N_COLS
test/t_8114 33 4
SELECT NAME, POS, MTYPE, PRTYPE, LEN FROM INFORMATION_SCHEMA.INNODB_SYS_COLUMNS WHERE TABLE_ID IN (SELECT TABLE_ID FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES WHERE NAME LIKE "%t_8114");
NAME POS MTYPE PRTYPE LEN
Column_2 0 2 524542 5
Column_1 65536 2 532734 5
INSERT INTO t_8114 VALUES (default, "aa");
INSERT INTO t_8114 VALUES (default, "bb");
INSERT INTO t_8114 VALUES (default, "ee");
INSERT INTO t_8114 VALUES (default, "pp");
SELECT * FROM t_8114;
Column_1 Column_2
8.142 aa
8.142 bb
8.142 ee
8.142 pp
ALTER TABLE t_8114 DROP Column_1;
SELECT NAME FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES WHERE NAME LIKE "%t_8114";
NAME
test/t_8114
SELECT NAME, POS, MTYPE, PRTYPE, LEN FROM INFORMATION_SCHEMA.INNODB_SYS_COLUMNS WHERE TABLE_ID IN (SELECT TABLE_ID FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES WHERE NAME LIKE "%t_8114");
NAME POS MTYPE PRTYPE LEN
Column_2 0 2 524542 5
SELECT * FROM t_8114;
Column_2
aa
bb
ee
pp
DROP TABLE t_8114;
|
