需求背景是给一个表名然后给出相应的表结构信息及索引信息
常用的命令有如下:
1. desc tableName; desc employees.employees;
2. show columns from tableName; show COLUMNS from employees.employees;
3. describe tableName; DESCRIBE employees.employees;
这三个显示的结果都是一样的,显示表中filed,type,null,key,default及extra。
4. show create table tableName; show CREATE TABLE employees.employees;
这个语句会显示这个表的建表语句。
5. select * from columns where table_name='表名';select * from information_schema.COLUMNS where TABLE_SCHEMA='employees' and TABLE_NAME='employees';
这个显示的结果就比较全了。
接下来,来点更全的sql,这个是用来同步mysql和orac数据字典的所有sql。
mysql部分:
1 ## 查看所有的库
2 SELECT
3 lower(schema_name) schema_name
4 FROM
5 information_schema.schemata
6 WHERE
7 schema_name NOT IN (
8 'mysql',
9 'information_schema',
10 'test',
11 'search',
12 'tbsearch',
13 'sbtest',
14 'dev_ddl'
15 )
16
17 ## 产看某一个库中的所有表
18 SELECT
19 table_name,
20 create_time updated_at,
21 table_type,
22 ENGINE,
23 table_rows num_rows,
24 table_comment,
25 ceil(data_length / 1024 / 1024) store_capacity
26 FROM
27 information_schema.TABLES
28 WHERE
29 table_schema = 'employees'
30 AND table_name NOT LIKE 'tmp#_%' ESCAPE '#'
31
32 ##查看某一个库下某一个表的所有字段
33 SELECT
34 lower(column_name) column_name,
35 ordinal_position position,
36 column_default dafault_value,
37 substring(is_nullable, 1, 1) nullable,
38 column_type data_type,
39 column_comment,
40 character_maximum_length data_length,
41 numeric_precision data_precision,
42 numeric_scale data_scale
43 FROM
44 information_schema.COLUMNS
45 WHERE
46 table_schema = 'employees'
47 AND table_name = 'employees';
48
49
50 ## 查看某一个库下某一张表的索引
51
52 SELECT DISTINCT
53 lower(index_name) index_name,
54 lower(index_type) type
55 FROM
56 information_schema.statistics
57 WHERE
58 table_schema = 'employees'
59 AND table_name = 'employees';
60
61 ## 查看某一个库下某一张表的某一个索引
62
63 SELECT
64 lower(column_name) column_name,
65 seq_in_index column_position
66 FROM
67 information_schema.statistics
68 WHERE
69 table_schema = 'employees'
70 AND table_name = 'employees'
71 AND index_name = 'primary';
72
73 ## 查看某一个库下某一个表的注释
74 SELECT
75 table_comment comments
76 FROM
77 information_schema.TABLES
78 WHERE
79 table_schema = 'employees'
80 AND table_name = 'employees';
81
82 ## 查看某一个库下某一个表的列的注释
83 SELECT
84 lower(column_name) column_name,
85 column_comment comments
86 FROM
87 COLUMNS
88 WHERE
89 table_schema = 'employees'
90 AND table_name = 'employees';
mysql查看表结构信息
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转载自blog.csdn.net/do_you_ac_today/article/details/83215283
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