子类型:CHARACTER 等价的PL/SQL类型:CHAR 子类型:CHARACTER VARYING 等价的PL/SQL类型:VARCHAR2 子类型:NATIONAL CHAR 等价的PL/SQL类型:NCHAR 子类型:NATIONAL CHAR VARYING 等价的PL/SQL类型:NVARCHAR2 子类型:NATIONAL CHARACTER 等价的PL/SQL类型:NCHAR 子类型:NATIONAL CHARACTER VARYING 等价的PL/SQL类型:NVARCHA...
· 支持Toast的数据类型应当是可变长度的(variable-length) · 表中任何一个字段有Toast,这个表都会有这一个相关联的Toast表,OID被存储在pg_class.reltoastrelid里 · 超出的的数值将会被分割成chunks,并且最多toast_max_chunk_size 个byte(缺省是2KB) · 当存储的列长度超过toast_tuple_threshold值(通常是2KB)...
· 支持Toast的数据类型应当是可变长度的(variable-length) · 表中任何一个字段有Toast,这个表都会有这一个相关联的Toast表,OID被存储在pg_class.reltoastrelid里 · 超出的的数值将会被分割成chunks,并且最多toast_max_chunk_size 个byte(缺省是2KB) · 当存储的列长度超过toast_tuple_threshold值(通常是2KB)...
3 isc_imgid bigint NOT NULL, 4 isc_imgname character varying(64), 5 isc_updatetime timestamp without time zone, 6 isc_id bigint, -- 插入顺序编号(由序列生成) 7 isc_imgdata bytea, 8 CONSTRAINT ist_image_pkey PRIMARY KEY (isc_imgid) 9 ) 1. 2. 3. 4. 5. 6. 7. 8. 9. 自...
bit varying [ (n) ] varbit variable-length bit string:变长位串 boolean bit boolean bool logical boolean (true/false):布尔值 box rectangular box on a plane bytea binary data ("byte array") character varying varchar character varying [ (n) ] varchar [ (n) ] variable-...
character varying(n) 或 varchar(n) 变长字符串类型,最大空间1GB,存储空间4+实际的字符串长度。与MySQL中的varchar(n)或text(n),以及Oracle中的varchar2(n)类似,但是在MySQL中varchar最多只有64KB,Oracle中的varchar2最多只有4000字节。 character(n)或char(n) 定长字符串类型,不足空白补充。最大1GB,存储空间...
create table toast_t1(dd character varying); alter table toast_t1 alter column dd set storage main; /d+ toast_1 Column | Type | Storage | ---+---+---+- dd | character varying | main | Access method: heap 查看Toast表的名字 -...
This is the reason why the PostgreSQL Varchar data type is called the variable-length data type. The PostgreSQL Varchar data types are: Varchar(n) Character Varying(n) A) PostgreSQL Varchar Data Type – Syntax variable_name VARCHAR(n) Or variable_name VARYINGING(n) Here, variable_name is ...
create function f_random_str(length INTEGER) returns character varying LANGUAGE plpgsql AS $$ DECLARE result varchar(50); BEGIN SELECT array_to_string(ARRAY(SELECT chr((65 + round(random() * 25)) :: integer) FROM generate_series(1,length)), '') INTO result; ...
CREATE TABLE students (status character varying(30)) PARTITION BY LIST(status); CREATE TABLE stu_active PARTITION OF students FOR VALUES IN ('ACTIVE'); CREATE TABLE stu_exp PARTITION OF students FOR VALUES IN ('EXPIRED'); CREATE TABLE stu_others PARTITION OF students DEFAULT; \d+ students ...