您可以命名特定对象以获取更多信息。使用+运算符还将列出表的约束和索引。postgres=# \d+ example_tbl Table "public.example_tbl"Column | Type | Collation | Nullable | Default | Storage | Compression | Stats target | Description---+---+---+---+---+---+---+---+---id | ...
postgres=# select datname,datdba,enconding,datlastsysoid,datfrozenxid,datminmxid,dattablespace from pg_database; ERROR: column "enconding" does not exist LINE 1: select datname,datdba,enconding,datlastsysoid,datfrozenxid,d... ^ HINT: Perhaps you meant to reference the column "pg_data...
email | character varying(255) | not null | extended 76 | | is_active | boolean | not null | plain 8 | |falseIndexes:"table_name_pkey"PRIMARY KEY, btree (id) Foreign keys:"table_name_user_id_fkey"FOREIGN KEY (user_id) REFERENCES"users"(id) ON DELETE CASCADE ON UPDATE CASCADE Che...
布尔类型(boolean type) 用于表示true或false mydb=# \d test_bool; Table "public.test_bool" Column | Type | Collation | Nullable | Default ---+---+---+---+--- flag | boolean | | | remark | text | | | mydb=# insert into test_bool (flag, remark) values ('t', 'True'), ...
postgres=#createtablecas_test(idint, c1boolean);CREATETABLEpostgres=# \setVERBOSITYverbosepostgres=#insertintocas_testvalues(1,int'1'); ERROR:42804:column"c1"isoftypebooleanbut expressionisoftypeintegerLINE1:insertintocas_testvalues(1,int'1'); ...
Column | Type | Collation | Nullable | Default ---+---+---+---+--- id | integer | | | info | text | | | 1. 2. 3. 4. 5. 6. 7. 8. 列名也是同样如此: bill@bill=>create table test(Id int,INFO text); CREATE TABLE bill@bill=>select id,info from test...
security_barrier (boolean):#如果希望视图提供行级安全性,应该使用这个参数。 query:#提供视图的行和列的一个 SELECT 或者VALUES 命令。 WITH [ CASCADED | LOCAL ] CHECK OPTION:#这个选项控制自动可更新视图的行为。这个选项被指定时,将检查该视图上的 INSERT 和UPDATE 命令以确保新行满足视图的定义条件(也就...
postgres=# create index idx_test_id on test(id); CREATE INDEX postgres=# \d test Table "public.test" Column | Type | Collation | Nullable | Default ---+---+---+---+--- id | integer | | | name | text | | | Indexes: "idx_test_id" btree (id) postgres=# explain analyze...
DBMS_LOB.INSTR (lob_column, pattern) 1. 2. 例子: SELECT DBMS_LOB.SUBSTR (resume, 5, 18), DBMS_LOB.INSTR (resume,' = ') FROM employees WHERE employee_id IN (170, 405); 1. 2. 3. 4. 删除: DELETE FROM employees WHERE employee_id = 405; ...
一、pg_buffercache 主要作用是查看pg的共享池中缓存的对象信息 1.1 创建扩展postgres=# create extension pg_buffercache;CREATE EXTENSION 1.2 查看视图pg_buffercache postgres=# \d pg_buffercache View "public.pg_buffercache" Column | Type | Collation | Nullable | Default ---+---+...