2
DROP TABLE IF EXISTS t1;
9
f6 VARCHAR(255) UNICODE,
10
f7 VARCHAR(260) UNICODE,
13
f10 MEDIUMTEXT UNICODE,
17
SELECT * FROM information_schema.columns
18
WHERE table_schema LIKE 'test%'
19
ORDER BY table_schema, table_name, column_name;
20
TABLE_CATALOG TABLE_SCHEMA TABLE_NAME COLUMN_NAME ORDINAL_POSITION COLUMN_DEFAULT IS_NULLABLE DATA_TYPE CHARACTER_MAXIMUM_LENGTH CHARACTER_OCTET_LENGTH NUMERIC_PRECISION NUMERIC_SCALE CHARACTER_SET_NAME COLLATION_NAME COLUMN_TYPE COLUMN_KEY EXTRA PRIVILEGES COLUMN_COMMENT STORAGE FORMAT
21
NULL test t1 f1 1 NO char 1 2 NULL NULL ucs2 ucs2_general_ci char(1) PRI select,insert,update,references Default Default
22
NULL test t1 f10 9 NULL YES mediumtext 8388607 16777215 NULL NULL ucs2 ucs2_general_ci mediumtext select,insert,update,references Default Default
23
NULL test t1 f11 10 NULL YES longtext 2147483647 4294967295 NULL NULL ucs2 ucs2_general_ci longtext select,insert,update,references Default Default
24
NULL test t1 f2 2 NULL YES char 0 0 NULL NULL ucs2 ucs2_general_ci char(0) select,insert,update,references Default Default
25
NULL test t1 f3 3 NULL YES char 10 20 NULL NULL ucs2 ucs2_general_ci char(10) select,insert,update,references Default Default
26
NULL test t1 f5 4 NULL YES varchar 0 0 NULL NULL ucs2 ucs2_general_ci varchar(0) select,insert,update,references Default Default
27
NULL test t1 f6 5 NULL YES varchar 255 510 NULL NULL ucs2 ucs2_general_ci varchar(255) select,insert,update,references Default Default
28
NULL test t1 f7 6 NULL YES varchar 260 520 NULL NULL ucs2 ucs2_general_ci varchar(260) select,insert,update,references Default Default
29
NULL test t1 f8 7 NULL YES text 32767 65535 NULL NULL ucs2 ucs2_general_ci text select,insert,update,references Default Default
30
NULL test t1 f9 8 NULL YES tinytext 127 255 NULL NULL ucs2 ucs2_general_ci tinytext select,insert,update,references Default Default
31
##########################################################################
32
# Show the quotient of CHARACTER_OCTET_LENGTH and CHARACTER_MAXIMUM_LENGTH
33
##########################################################################
35
CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH AS COL_CML,
39
FROM information_schema.columns
40
WHERE table_schema LIKE 'test%'
41
AND CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH = 1
42
ORDER BY CHARACTER_SET_NAME, COLLATION_NAME, COL_CML;
43
COL_CML DATA_TYPE CHARACTER_SET_NAME COLLATION_NAME
45
CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH AS COL_CML,
49
FROM information_schema.columns
50
WHERE table_schema LIKE 'test%'
51
AND CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH <> 1
52
ORDER BY CHARACTER_SET_NAME, COLLATION_NAME, COL_CML;
53
COL_CML DATA_TYPE CHARACTER_SET_NAME COLLATION_NAME
54
2.0000 char ucs2 ucs2_general_ci
55
2.0000 longtext ucs2 ucs2_general_ci
56
2.0000 mediumtext ucs2 ucs2_general_ci
57
2.0000 text ucs2 ucs2_general_ci
58
2.0000 varchar ucs2 ucs2_general_ci
59
2.0079 tinytext ucs2 ucs2_general_ci
61
CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH AS COL_CML,
65
FROM information_schema.columns
66
WHERE table_schema LIKE 'test%'
67
AND CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH IS NULL
68
ORDER BY CHARACTER_SET_NAME, COLLATION_NAME, COL_CML;
69
COL_CML DATA_TYPE CHARACTER_SET_NAME COLLATION_NAME
70
NULL char ucs2 ucs2_general_ci
71
NULL varchar ucs2 ucs2_general_ci
72
--> CHAR(0) is allowed (see manual), and here both CHARACHTER_* values
73
--> are 0, which is intended behavior, and the result of 0 / 0 IS NULL
74
SELECT CHARACTER_OCTET_LENGTH / CHARACTER_MAXIMUM_LENGTH AS COL_CML,
79
CHARACTER_MAXIMUM_LENGTH,
80
CHARACTER_OCTET_LENGTH,
84
FROM information_schema.columns
85
WHERE table_schema LIKE 'test%'
86
ORDER BY TABLE_SCHEMA, TABLE_NAME, ORDINAL_POSITION;
87
COL_CML TABLE_SCHEMA TABLE_NAME COLUMN_NAME DATA_TYPE CHARACTER_MAXIMUM_LENGTH CHARACTER_OCTET_LENGTH CHARACTER_SET_NAME COLLATION_NAME COLUMN_TYPE
88
2.0000 test t1 f1 char 1 2 ucs2 ucs2_general_ci char(1)
89
NULL test t1 f2 char 0 0 ucs2 ucs2_general_ci char(0)
90
2.0000 test t1 f3 char 10 20 ucs2 ucs2_general_ci char(10)
91
NULL test t1 f5 varchar 0 0 ucs2 ucs2_general_ci varchar(0)
92
2.0000 test t1 f6 varchar 255 510 ucs2 ucs2_general_ci varchar(255)
93
2.0000 test t1 f7 varchar 260 520 ucs2 ucs2_general_ci varchar(260)
94
2.0000 test t1 f8 text 32767 65535 ucs2 ucs2_general_ci text
95
2.0079 test t1 f9 tinytext 127 255 ucs2 ucs2_general_ci tinytext
96
2.0000 test t1 f10 mediumtext 8388607 16777215 ucs2 ucs2_general_ci mediumtext
97
2.0000 test t1 f11 longtext 2147483647 4294967295 ucs2 ucs2_general_ci longtext