postgres=# \d+ example_tbl Table "public.example_tbl"Column | Type | Collation | Nullable | Default | Storage | Compression | Stats target | Description---+---+---+---+---+---+---+---+---id | integer | | not null | | plain | ...
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'), ...
edb_enable_pruning ParameterType:BooleanDefaultValue:trueRange: {true|false} Minimum ScopeofEffect: PersessionWhenValueChanges Take Effect:ImmediateRequiredAuthorizationtoActivate:SessionuserWhensettoTRUE, edb_enable_pruning allows the query plannertoearly-prune partitionedtables. Early-pruning means that the ...
兼容性:下列类型是在SQL标准中定义的:bit,bit varying,boolean,char,character,character varying,varchar,date,double precision,integer,interval,numeric,decimal,real,smallint,time(包括有时区和无时区的),timestamp(包括有时区和无时区的)。 PostgreSQL的词法分析器在解析用户发出的SQL命令时,首先将其中的单词分成五...
Column| Type | Collation | Nullable |Default| Storage | Stats target | Description ---+---+---+---+---+---+---+--- v1 |smallint| | | | plain | | 小整型最小范围 v2 |smallint| | | | plain | | 小整型最大范围 v3 |integer| | | | plain | | 整型最小...
boolean1 字节true/false 枚举类型 枚举类型是一个包含静态和值的有序集合的数据类型。 PostgreSQL 中的枚举类型类似于 C 语言中的 enum 类型。 与其他类型不同的是枚举类型需要使用 CREATE TYPE 命令创建。 CREATE TYPE mood AS ENUM('sad','ok','happy'); ...
var schema = { "items": { "type": "boolean" }};var data1 = [true, false];var data2 = [true, 123];console.log(tv4.error);tests["Valid Data1"] = tv4.validate(data1, schema);tests["Valid Data2"] = tv4.validate(data2, schema); ...
deduplicate_items (boolean):B 树重复数据删除技术的使用。设置为 ON 或 OFF 以启用或禁用优化。默认值为ON。 vacuum_cleanup_index_scale_factor:指定在以前的统计信息收集过程中计数到的堆元组总数的一个分数,插入不超过这一数量所代表的元组不会导致VACUUM清理阶段的索引扫描。这个设置当前仅适用于B-树索引。 bu...
b_flag boolean; begin null; end; /PL/SQL变量和数据库变量长度区别: CHAR 32767BYTE O8DATABASE 2000BYTE O7DATABASE 256BYTE VARCHAR2 32767BYTE O8DATABASE 4000BYTE O7DATABASE 2000BYTE LONG 32760BYTE 2G LONG RAW 32760BYTE 2G 列名的优先级别高于变量!
GET DIAGNOSTICS integer_var = ROW_COUNT; The second method to determine the effects of a command is to check the special variable named FOUND, which is of type boolean. FOUND starts out false within each PL/pgSQLfunction call. It is set by each of the following types of statements: ...