char=char(1)。 text:不限长。最长的可能字符串大概是1GB左右。 在postgresql中的char(n)通常在三个当中最慢的,因为需要读取空白字符的额外开销。一般应该使用varchar或text 7.bytea hex format:将二进制数据编码为每字节两位十六进制数据,整条字符串以\x开头。这种模式能够和很多外部应用程序和协议兼容
The TEXT data type in PostgreSQL is used to store variable-length character strings without a specific length limit. It is highly versatile and ideal for scenarios where the maximum size of a string is unknown or unbounded. Unlike VARCHAR(n), which requires a defined length, TEXT eliminates th...
sql standard sqlserver postgresql postgresqlaliases description bigint bigint bigint int8 signed eight-byte integer:有符号8字节整数 bigserial serial8 autoinc
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...
postgresql aliases description bigint bigint bigint int8 signed eight-byte integer:有符号8字节整数 bigserial serial8 autoincrementing eight-byte integer:自增属性的 bigint bit binary bit [ (n) ] fixed-length bit string:定长位串 bit varying varbinary bit varying [ (n) ] varbit...
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.
The NUMERIC type can hold a value of up to 131,072 digits before the decimal point 16,383 digits after the decimal point. The scale of the NUMERIC type can be zero, positive, or negative. PostgreSQL 15 or later allows you to declare a numeric column with a negative scale. The following...
A PostgreSQLINTERVALdata type represents a duration of time, such as the time between two events, an event's duration, etc. It takes 16 bytes of storage and ranges between -178000000 to +178000000 years. It stores a period of time as a single value(e.g., years, months, days, hours,...
Amazon Redshift data typeRDS PostgreSQL or Aurora PostgreSQL data typeDescription SMALLINTSMALLINTSigned two-byte integer INTEGERINTEGERSigned four-byte integer BIGINTBIGINTSigned eight-byte integer DECIMALDECIMALExact numeric of selectable precision ...
"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, see Special Character Types in the PostgreSQL documentation. Text Search Types TXID_SNAPSHOT UUID XM...