MySql 5.7 wrong (apparently) value of character_maximum_lengthPosted by: Nicola Farina Date: August 12, 2024 04:26AM Hi I am trying to analyze a table structure, to understand why ALTER TABLE operations take so long time. My attention comes to longtext and mediumtext columns. One of...
mysql手册的解释：CHARACTER_MAXIMUM_LENGTH：以字符为单位的最大长度，适于二进制数据、字符数据，或者文本和图像数据。否则，返回 NULL。CHARACTER_OCTET_LENGTH：以字节为单位的最大长度，适于二进制数据、字符数据，或者文本和图像数据。否则，返回 NULL。CHARACTER_OCTET_LENGTH应与CHARACTER_MAXIMUM_LENGTH相...
【操作系统】:【CPU】: 【问题描述】*: MySQL :information_schema CHARACTER_MAXIMUM_LENGTH 字符串类型的列的最大长度,字符为单位 select CHARACTER_MAXIMUM_LENGTH into v_max_length from information_schema.columns 达梦DBA_TAB_COLUMNS 如果等价改写后面需不要加条件过滤如 select data_length into v_max_lengt...
(0.00 sec) mysql> CREATE TABLE bug (a char(150) CHARACTER SET utf8); Query OK, 0 rows affected (0.16 sec) mysql> SELECT column_name, column_type, character_maximum_length, character_octet_length -> FROM information_schema.columns WHERE table_schema='test' AND table_name='bug'; +---...
to mysql-<version>-build Version is in (5.0,5.1,6.0). 1. The tests "<engine>__datadict" do no more exist. 2. The checks where the problem above occured were moved into the new test "is_columns_...". 3. Files with expected results were generated for MySQLÖ 5.0, 5.1 and 6.0...
('a', 'abcdefghi'); show warnings; select * from bad_info; show variables like '%version%'; mysql> create table bad_info (f1 char(1) not null, f2 char(9) not null) default character set utf8; Query OK, 0 rows affected (0.09 sec) mysql> select CHARACTER_MAXIMUM_LENGTH, ...
Re: MySql 5.7 wrong (apparently) value of character_maximum_lengthPosted by: Guisen Yang Date: August 12, 2024 08:56PM CHARACTER_MAXIMUM_LENGTH is the upper limit, not the maximum length that exists for the field. CHARACTER_MAXIMUM_LENGTH For string columns, the maximum length in ...