PostgreSQL Data Types Boolean CHAR, VARCHAR, and TEXT NUMERIC DOUBLE PRECISION REAL Integer SERIAL DATE TIMESTAMP Interval TIME UUID JSON HSTORE Array User-defined Data Types Enum XML BYTEA Composite Types Conditional Expressi...
PostgreSQL has a rich set of native data types available to users. Users can add new types to PostgreSQL using the CREATE TYPE command. PostgreSQL有一组丰富的本地数据类型可供用户使用。用户可以使用CREATE TYPE命令向PostgreSQL添加新类型。Each data type has an external representation determined by its...
在许多编程语言支持枚举类型,它们是相等。 Unlike other types, Enumerated Types need to be created using CREATE TYPE command. This type is used to store a static, ordered set of values, for example compass directions, i.e. NORTH, SOUTH, EAST, and WEST or days of the week as below: CREATE...
Category - Binary Data TypesNameDescriptionStorage Size bytea variable-length binary string 1 or 4 bytes plus the actual binary stringCategory - Date/Time TypesNameDescriptionStorage Size Low Value High Value Resolution timestamp [ (p) ] [ without time zone ] both date and time (no time ...
bytea_output = 'escape' # hex, escape 意思是设置bytea_output的输出类型设置为转义类型输出,而postgres默认是hex类型输出,所以导致转换数据混乱问题 参考文档: 8.4. Binary Data Types The bytea data type allows storage of binary strings; see Table 8-6. ...
bytea: 二进制数据("位数组") character varying [(n)]: 可变长度的字符串 character [(n)]: 固定长度的字符串 cidr: IPv4 或者 IPv6 网络地址 circle: 平面上的一个圆 date: 日历日期 ( 年月日) double precision: 双精度浮点数(8位) inet: IPv4 或者 IPv6 主机地址 integer: 有符号的四位整数 ...
Database [postgres]: Port [5432]: Username [postgres]: 用户postgres 的口令: psql (14.0) 输入"help" 来获取帮助信息. postgres=# \c szsfs20220220 您现在已经连接到数据库 "szsfs20220220",用户 "postgres". szsfs20220220=# select * from pg_available_extensions ; ...
Pseudo-Types Range Types Special Character Types "char" – A single-byte internal type (where the data type named char is enclosed in quotation marks). name – An internal type for object names. For more information about these types, seeSpecial Character Typesin the PostgreSQL documentation. ...
BackendKeyData (B) Byte1('K') :标志报文为取消关键数据,前端必须保存这些值,以便用于之后的CancelRequest报文 Int32(12) :内容长度,包含自身 Int32 :后端processID Int32 :后端的密钥 Bind (F) Byte1('B') :标志报文为Bind命令 Int32 :内容长度,包含自身 String :目标portal的名字(空字符串表示未命名)...
n_data[1]; /* Digits */ }; union NumericChoice { uint16 n_header; /* Header word */ struct NumericLong n_long; /* Long form (4-byte header) */ struct NumericShort n_short; /* Short form (2-byte header) */ }; struct NumericData { int32 vl_len_; /* varlena header (do ...