AnalyticDB PostgreSQL获取表信息

查找AnalyticDB表的DDL语句

select dump_talbe_ddl('tablename'::regclass);

1.获取AnalyticDB表

select * from information_schema.tables;

2.获取AnalyticDB列

select * from information_schema.columns;

3.获取ADB PG表中文名
获取表中文名：方法一

select t.schemaname  ,t.relname   --表英文名,description --表中文名
from pg_description d,pg_class c,pg_stat_all_tables t
where d.objoid = c.oidand objsubid = 0 and t.relname = c.relnameand t.schemaname = 'SCHEMANAME'and c.relname = 'tablename'
;

获取表中文名：方法二

select relname                --表英文名,obj_description(c.oid) --表中文名
from pg_class c
where obj_description(c.oid) is not null
and relname = 'tablename'
;

获取表中文名：方法三

select distinct a.relname --表英文名,b.description     --表中文名
from pg_class a
left join pg_description b
on a.oid = b.objoid
and b.objsubid = '0'
where a.relname = 'tablename'
;

4.获取表中文名、字段中文名、字段类型

select --t2.attnum,t2.relname   --表英文名,obj_description(t2.oid)  --表中文名,t2.field                 --字段英文名,t2.comment               --字段中文名,case when t2.type = 'varchar' then concat('varchar(',cast(t1.charachter_maximum_length as varchar),')')when t2.type = 'numeric' then concat('numeric(',numeric_precistion,',',numeric_scale,')')else t2.typeend  as type     --字段类型
from information_schema.columns t1
left join(
select a.attnum,c.oid,c.relname,a.attname as field,t.typname as type,a.attlen  as length,a.atttypmod as lengthvar,attnotnull  as notnull,b.description as comment
from pg_class c,pg_attribute aleft outer join pg_description b on a.attrelid = b.objoid and a.attnum =  b.objsubid,pg_type t
--where c.regclass = ('tablename')
where a.attnum >0
and a.attrelid = c.oid
and a.atttypid = t.oid
order by a.attnum
) t2
on t1.table_name = t2.relname
and t1.column_name = t2.field
where t1.table_schmea = 'SCHEMA'
and table_name = 'tablename'
order by relname,attnum
;

5.获取表中文名、字段中文名、字段类型、分布键

selectb.relname                         as 表名,obj_description(b.oid)           as 表中文名,a.attname                        as 字段英文名称,col_description(a.attrelid,a.attnum)   as 字段中文名称,replace(format_type(a.atttypid,a.atttypmod),'character varying','varchar') as 字段类型,(case when atttypmod -4 >0 then atttypmod -4 else 0 end) as 字段长度,(case when (select count(1) from gp_constraint where conrelid = a.attrelid and conkey[1] = attnum and contype = 'p') > 0then 'Y' else 'N' end) as 主键,(case when (select count(1) from gp_constraint where conrelid = a.attrelid and conkey[1] = attnum and contype = 'u') > 0then 'Y' else 'N' end) as 唯一约束,(case when (select count(1) from gp_constraint where conrelid = a.attrelid and conkey[1] = attnum and contype = 'f') > 0then 'Y' else 'N' end) as 外键约束,(case when a.attnotnull = true then 'N' else 'Y' end) as 是否允许NULL,case when c.attname is not null then 'Y' else 'N' end as 是否分布键from pg_attribute a
left join pg_class b on a.attrelid = b.pid
left join (select aaa.relname as 表名 ,ccc.attname, aaa.oidfrom ( select aa.oid,obj_description(aa.oid) as table_comment,aa.relname,bb.localoid,bb.distkey   as attrnums,,regexp_split_to_table(array_to_string(bb.distkey,','),',')  as att,dd.nspnamefrom pg_class aa -- 原数据信息，最主要的表left join gp_distribution_policy bb on bb.localoid = aa.oid  -- 分布键表left join pg_namespace dd on dd.oid = aa.relnamespace  -- 模式left join pg_inherits hh on aa.oid = hh.inhrelid  -- 继承表where dd.nspname = 'schema_name'  -- 替换需要的模式and hh.inhrelid is null) aaaleft join pg_attribute ccc on ccc.attrelid = aaa.oidand     cast(ccc.attnum as text) = aaa.attwhere ccc.attnum >0) c
on a.attrelid = c.oid
and a.attname = c.attname
left join information_schema.columns e on attname = e.column_name
and b.relname = e.table_name
where attstattarget = -1
and e.table_schmea = 'schema_name'
and b.relname = 'table_name'
order by b.rename,e.ordinal_position
;

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