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MySQL数据库中查找最常用的数据类型
发布时间：2025-11-05 13:20:13 来源：码上建站 作者：IT科技
一、据库据类概述
今天分享几个关于MySQL数据类型的中查找最查询，具体如下：
在 MySQL 数据库中查找最常用的常用数据类型查找 MySQL 数据库中的所有数字列查找 MySQL 数据库中的所有字符串（字符）列查找 MySQL 数据库中的所有日期和时间列查找 MySQL 数据库中的所有枚举列查找 MySQL 数据库中的所有空间数据列查找 MySQL 数据库中的所有 JSON 数据列在 MySQL 数据库中查找大对象 (LOB) 数据类型列在 MySQL 数据库中查找具有大对象 (LOB) 数据类型列的表二、相关SQL
1. 在 MySQL 数据库中查找最常用的据库据类数据类型select data_type,
count(*) as columns,
cast(100*count(*)/sum_all.columns as decimal(36,2))
as percent_columns,
count(distinct concat(col.table_schema, ., col.table_name))
as tables,
cast(100*count(distinct concat(col.table_schema,.,col.table_name))
/ sum_all.tables as decimal(36,2)) as percent_tables
from information_schema.columns col
join (select count(distinct concat(c.table_schema, ., c.table_name))
as tables,
count(*) as columns
from information_schema.columns c
join information_schema.tables t
on c.table_schema = t.table_schema
and c.table_name = t.table_name
where t.table_schema not in (information_schema, mysql,
performance_schema, sys)
and t.table_type = BASE TABLE
) sum_all on true
join information_schema.tables tab
on col.table_schema = tab.table_schema
and col.table_name = tab.table_name
where tab.table_schema not in (information_schema, mysql,
performance_schema, sys)
and tab.table_type = BASE TABLE
group by data_type,
sum_all.columns,
sum_all.tables
order by columns desc;说明：
data_type - 没有长度或精度的内置或用户数据类型，例如 int、中查找最varchar 或 datetimecolumns - 具有此数据类型的常用数据库（模式）中的列数percent_columns - 具有此数据类型的列的百分比。行总数为 100%tables- 数据库（模式）中具有此数据类型的据库据类表数percent_tables - 具有此数据类型的列的香港云服务器表的百分比。
2. 查找 MySQL 数据库中的中查找最所有数字列select col.table_schema as database_name,
col.table_name,
col.ordinal_position as col_id,
col.column_name,
col.data_type,
col.numeric_precision,
col.numeric_scale
from information_schema.columns col
join information_schema.tables tab on tab.table_schema = col.table_schema
and tab.table_name = col.table_name
and tab.table_type = BASE TABLE
where col.data_type in (tinyint, smallint, mediumint,
int, bigint, decimal, bit,
float, double)
and col.table_schema not in (information_schema, sys,
performance_schema, mysql)
--and col.table_schema = database_name -- put your database name here
order by col.table_schema,
col.table_name,
col.ordinal_position;说明：
database_name - 数据库的名称（模式）table_name - 表的名称column_id - 表中的列位置column_name - 列的名称data_type - 数据类型numeric_precision - 列的精度numeric_scale - 列的比例
2. 查找 MySQL 数据库中的所有字符串（字符）列select col.table_schema as database_name,
col.table_name,
col.ordinal_position as column_id,
col.column_name,
col.data_type,
col.character_maximum_length as maximum_length,
col.character_set_name
from information_schema.columns col
join information_schema.tables tab on tab.table_schema = col.table_schema
and tab.table_name = col.table_name
and tab.table_type = BASE TABLE
where col.data_type in (char, varchar, binary, varbinary,
blob, tinyblob, mediumblob, longblob,
text, tinytext, mediumtext, longtext
enum, set)
and col.table_schema not in (information_schema, sys,
performance_schema, mysql)
--and col.table_schema = database_name -- put your database name here
order by col.table_schema,
col.table_name,
col.ordinal_position;说明：
database_name - 数据库的名称（模式）table_name - 表的名称column_id - 表中的列位置column_name - 列的名称data_type - 数据类型maximum_length - 字符的最大长度character_set_name - 字符集名称
4. 查找 MySQL 数据库中的所有日期和时间列select col.table_schema as database_name,
col.table_name,
col.ordinal_position as column_id,
col.column_name,
col.data_type,
col.datetime_precision
from information_schema.columns col
join information_schema.tables tab on tab.table_schema = col.table_schema
and tab.table_name = col.table_name
and tab.table_type = BASE TABLE
where col.data_type in (date, time, datetime, year, timestamp)
and col.table_schema not in (information_schema, sys,
performance_schema, mysql)
--and col.table_schema = database_name -- put your database name here
order by col.table_schema,
col.table_name,
col.ordinal_position;说明：
database_name - 数据库的名称（模式）table_name - 表的名称column_id - 表中的列位置column_name - 列的名称data_type - 数据类型datetime_precision - 小数秒精度
5. 查找 MySQL 数据库中的所有枚举列select col.table_schema as database_name,
col.table_name,
col.ordinal_position as column_id,
col.column_name,
col.data_type,
trim(leading enum from col.column_type) as enum_values
from information_schema.columns col
join information_schema.tables tab on tab.table_schema = col.table_schema
and tab.table_name = col.table_name
and tab.table_type = BASE TABLE
where col.data_type in (enum)
and col.table_schema not in (information_schema, sys,
performance_schema, mysql)
--and col.table_schema = database_name -- put your database name here
order by col.table_schema,
col.table_name,
col.ordinal_position;说明：
database_name - 数据库的名称（模式）table_name - 表的IT技术网名称column_id - 表中的列位置column_name - 列的名称data_type - 数据类型enum_values - 声明可能的枚举值
6. 查找 MySQL 数据库中的所有空间数据列select col.table_schema as database_name,
col.table_name,
col.ordinal_position as column_id,
col.column_name,
col.data_type,
col.is_nullable
from information_schema.columns col
join information_schema.tables tab
on col.table_schema = tab.table_schema
and col.table_name = tab.table_name
and table_type = BASE TABLE
where col.data_type in (geometry, point, linestring, polygon,
multipoint, multilinestring, multipolygon,
geometrycollection)
and col.table_schema not in (information_schema, sys,
performance_schema, mysql)
-- and table_schema = database_name -- put your database name here
order by col.table_schema,
col.table_name;说明：
(1)database_name - 数据库的名称（模式）
(2)table_name - 表的名称
(3)column_id - 表中的列位置
(4)column_name - 列的名称
(5)data_type - 空间数据的类型：
GEOMETRYPOINTLINESTRINGPOLYGONMULTIPOINTMULTILINESTRINGMULTIPOLYGONGEOMETRYCOLLECTION(6)is_nullable - 指示列是否可以包含空值
7. 查找 MySQL 数据库中的所有 JSON 数据列select col.table_schema as database_name,
col.table_name,
col.ordinal_position as column_id,
col.column_name,
col.data_type
from information_schema.columns col
join information_schema.tables tab on tab.table_schema = col.table_schema
and tab.table_name = col.table_name
and tab.table_type = BASE TABLE
where col.data_type in (json)
and col.table_schema not in (information_schema, sys,
performance_schema, mysql)
--and col.table_schema = database_name -- put your database name here
order by col.table_schema,
col.table_name,
col.ordinal_position;说明：
database_name - 数据库的名称（模式）table_name - 表的名称column_id - 表中的列位置column_name - 列的名称data_type - 数据类型
8. 在 MySQL 数据库中查找大对象 (LOB) 数据类型列select tab.table_schema as database_name,
tab.table_name,
col.column_name,
col.data_type
from information_schema.tables as tab
inner join information_schema.columns as col
on col.table_schema = tab.table_schema
and col.table_name = tab.table_name
where tab.table_schema = your database name
and tab.table_type = BASE TABLE
and col.data_type in (blob, mediumblob, longblob,
text,mediumtext,longtext)
order by tab.table_name,
col.column_name;说明：
schema_name - 数据库的名称（模式）table_name - 表的名称column_name - 列的名称data_type - 数据类型
9. 在 MySQL 数据库中查找具有大对象 (LOB) 数据类型列的表select tab.table_name,
count(*) as columns
from information_schema.tables as tab
inner join information_schema.columns as col
on col.table_schema = tab.table_schema
and col.table_name = tab.table_name
and col.data_type in (blob, mediumblob, longblob,
text, mediumtext, longtext)
where tab.table_schema = your database name
and tab.table_type = BASE TABLE
group by tab.table_name
order by tab.table_name;说明：
table_name - 表的名称columns - 表中的 LOB 列数
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