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PostgreSQL常用数据类型

2014-09-08 15:04 375 查看
一、数据类型

NameAliasesDescription
bigintint8signed eight-byte integer
bigserialserial8autoincrementing eight-byte integer
bit [ (n) ]fixed-length bit string
bit varying [ (n) ]varbitvariable-length bit string
booleanboollogical Boolean (true/false)
boxrectangular box on a plane
byteabinary data ("byte array")
character [ (n) ]char [ (n) ]fixed-length character string
character varying [ (n) ]varchar [ (n) ]variable-length character string
cidrIPv4 or IPv6 network address
circlecircle on a plane
datecalendar date (year, month, day)
double precisionfloat8double precision floating-point number (8 bytes)
inetIPv4 or IPv6 host address
integerint, int4signed four-byte integer
interval [ fields ] [ (p) ]time span
jsonJSON data
lineinfinite line on a plane
lsegline segment on a plane
macaddrMAC (Media Access Control) address
moneycurrency amount
numeric [ (p, s) ]decimal [ (p, s) ]exact numeric of selectable precision
pathgeometric path on a plane
pointgeometric point on a plane
polygonclosed geometric path on a plane
realfloat4single precision floating-point number (4 bytes)
smallintint2signed two-byte integer
smallserialserial2autoincrementing two-byte integer
serialserial4autoincrementing four-byte integer
textvariable-length character string
time [ (p) ] [ without time zone ]time of day (no time zone)
time [ (p) ] with time zonetimetztime of day, including time zone
timestamp [ (p) ] [ without time zone ]date and time (no time zone)
timestamp [ (p) ] with time zonetimestamptzdate and time, including time zone
tsquerytext search query
tsvectortext search document
txid_snapshotuser-level transaction ID snapshot
uuiduniversally unique identifier
xmlXML data
一个表能包含的字段数目。 根据字段类型的不同，这个数目可能在250到1600之间
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