Summary: in this tutorial, you will learn how to use the PostgreSQL REAL data type to store single-precision floating-point numbers in the database. Introduction to the PostgreSQL REAL data type The REAL data type allows you to store single-precision floating-point numbers in the database. A...
AI代码解释 real类型长度计算:定长计算方法 heap_compute_data_size data_length=att_align_datum(data_length,atti->attalign,atti->attlen,val);data_length=att_addlength_datum(data_length,atti->attlen,val);decimal类型长度计算:变长计算方法 heap_compute_data_sizeif(ATT_IS_PACKABLE(atti)&&VARATT_CAN...
bit, bit varying, boolean, char, character varying, character, varchar, date, double precision, integer, interval, numeric, decimal, real, smallint, time (with or without time zone), timestamp (with or without time zone), xml. SQL指定以下类型(或其拼写):bigint、bit、bit variation、boolean...
real float4 single precision floating-point number (4 bytes):单精度4字节浮点数 smallint smallint smallint int2 signed two-byte integer:小整数 smallserial serial2 autoincrementing two-byte integer:自增属性的smallint serial serial4 autoincrementing four-byte integer:自增属性的int ...
mysql和pg中的浮点数类型基本一致。mysql中4 bytes的浮点数类型有real,float4,4 bytes的浮点数类型double。pg中对应的也有real,float,float4,float8以及double precision,两者基本兼容。 bit类型: mysql中bit类型一般都是使用整数类型表示,所以支持的bit位数最大只能是64位。而在pg中有专门的bit类型bit(范围1～83886...
real: 单精度浮点数(4 位) smallint: 有符号的两位整数 serial: 自增长4位整数 text: 可变长度字符创 time [(p)] [without time zone]: 一天中的时间(无时区) time [(p)] with time zone: 一天中的时间,包含时区timestamp [(p)] [without time zone]: 日期和时间(没有时区) timestamp [(p)] ...
real float4 single precision floating-point number (4 bytes):单精度4字节浮点数 smallint smallint smallint int2 signed two-byte integer:小整数 smallserial serial2 autoincrementing two-byte integer:自增属性的smallint serial serial4 autoincrementing four-byte integer:自增属性的int text...
numeric | normal public | nanvl | real | real, character varying | normal public | nanvl | real | real, real | normal public | nvarchar2 | nvarchar2 | nvarchar2, integer, boolean | normal public | nvarchar2_transform | internal | internal | normal public | nvarchar2in | nvarchar2 |...
CREATE INDEX idx_real ON my_complex (((value).r)); \d my_complex; Table "public.my_complex" Column | Type | Collation | Nullable | Default ---+---+---+---+--- name | text | | | value | complex | | | Indexes: "idx_real" btree (((value).r)) CREATE INDEX idx_complex...
This document discusses PostgreSQL Data Types. While creating table, for each column, you specify a data type, i.e. what kind of data you want to store.