2 创建schema：pg_test_db=# create schema schema_a,创建表pg_test_db=# create table schema_a.table_a(id int, name varchar);3 现在我们要添加descr列。由于我们的脚本必须能够允许多次运行，所以再添加列的时候必须判断表中是否descr已经存在。Postgresql中information_schema.columns包含所有表的列信息。4 ...
postgres-# pg_column_size(row(is_shipped, user_id, order_total, order_dt, order_type, ship_dt, item_ct)), postgres-# pg_column_size(row(is_shipped, user_id, order_total, order_dt, order_type, ship_dt, item_ct, ship_cost)), postgres-# pg_column_size(row(is_shipped, user_id...
select * from information_schema.columns where table_name='表名' postgresql 查询所有数据库 SELECT * FROM pg_database; 查询表字段信息 test是表名 ,根据自己的来 select col.table_schema, col.table_name, col.ordinal_position, col.column_name, col.data_type, col.character_maximum_length, col...
LEFT JOIN pg_description d ON d.objoid = c.oid AND d.objsubid = '0' WHERE tb.table_schema = 'test_schema'; -- 查询所有列注释 SELECT col.table_name, col.column_name, col.ordinal_position AS o, d.description FROM information_schema.columns col JOIN pg_class c ON c.relname = col...
test=# alter table t1 add column co1601 int;psql:ERROR:table can have at most1600columns 会报错提示,表最大有1600列。此时如果再添加新列怎么办?能否添加呢? 3)我们drop一列,然后再添加一列,是否可以? 代码语言:javascript 复制 test=# alter table t1 drop column co1600;ALTERTABLEtest=# alter tabl...
: string | null;}const users = { tableName: 'users', columns: ['id', 'first_name', 'last_name', 'email', 'country'], requiredForInsert: ['first_name', 'last_name', 'email'], primaryKey: 'id', foreignKeys: {}, $type: null as unknown as Users, $input: null as...
一、查看pg 表字段‘名称’、‘类型’、‘非空’、‘注释’ SELECT a.attname as 字段名, format_type(a.atttypid,a.atttypmod) as 类型, a.attnotnull as 非空, col_description(a.attrelid,a.attnum) as 注释 FROM pg_class as c,pg_attribute as a ...
–information_schema.columns:展示数据库中所有列的基本信息,如列名、数据类型、是否为主键等。 –pg_tables:展示数据库中所有普通表的基本信息。 –pg_views:展示数据库中所有视图的基本信息。 –pg_indexes:展示数据库中所有索引的基本信息。 2、性能视图 ...
General \copyright show PostgreSQL usage and distribution terms \crosstabview [COLUMNS] execute query and display result in crosstab \errverbose show most recent error message at maximum verbosity \g [(OPTIONS)] [FILE] execute query (and send result to file or |pipe); \g with...
select col.table_schema, col.table_name, col.ordinal_position, col.column_name, col.data_type, col.character_maximum_length, col.numeric_precision, col.numeric_scale, col.is_nullable, col.column_default, des.description from information_schema.columns col left join pg_description des on col....