•double precision:8字节,双精度浮点数 这些类型可以存储小数值,例如: CREATETABLEexample ( id serialPRIMARYKEY,decdecimal(10,2), numnumeric(10,2), rreal, ddouble precision);INSERTINTOexample (dec, num, r, d)VALUES(1234.56,1234.56,1234.56,1234.56); 字符串类型 PostgreSQL支持各种字符串类型,包括...
Aggregate (cost=50.01..50.02rows=1width=4) (actualtime=112406.967..112406.967rows=1loops=1) Output: sum((i)::double precision), min((i)::double precision), max((i)::double precision), avg((i)::double precision), sum(('3'::double precision * ((i)::double precision + (i)::doubl...
-- 相当于同时执行了CREATE TYPE complex AS (r double precision, i double precision); CREATE TABLE complex (r double precision, i double precision); CREATE TABLE my_complex (name text, value complex); INSERT INTO my_complex (name, value) VALUES ('one', ROW(1.0, 1.0)); SELECT * FROM ...
now() - (random() * 365 * 86400)::INTEGER * INTERVAL '1 second' AS order_time, -- 修正:先将 double precision 转换为 numeric 类型,再进行四舍五入 round(((random() * 990 + 10))::numeric, 2) AS amount, (ARRAY['北京', '上海', '广东', '浙江', '江苏', '山东', '四川', ...
最后,Table 9-7显示了可用的三角函数。所有三角函数都有类型为double precision的参数和返回类型。每一种三角函数都有两个变体,一个以弧度度量角,另一个以角度度量角。 Table 9-7. 三角函数 Note: 另一种使用以角度度量的角的方法是使用早前展示的单位转换函数radians()和degrees()。不过,使用基于角度的三角函数...
("col_real",x=>x.Real).MapDouble("col_double",x=>x.DoublePrecision).MapByteArray("col_bytea",x=>x.ByteArray).MapUUID("col_uuid",x=>x.UUID).MapInetAddress("col_inet",x=>x.IpAddress).MapMacAddress("col_macaddr",x=>x.MacAddress).MapDate("col_date",x=>x.Date).MapInterval...
Decimal (Precisione > 28) Non supportato String Numeric Decimal Decimal Real Single Single Double Double Double SmallSerial Int16 Int16 Serial Int32 Int32 BigSerial Int64 Int64 Money Decimal String Char String String Varchar String String Text String String Bytea Byte[] Byte[] Timestamp DateTime...
Added support for double-escaping and unbalanced quotes in sp_tables table_type. Added restriction on dropping of Babelfish extensions for all users except admin role. Prevent partial upgrades of Babelfish extensions. sys procedure columnproperty now support additional properties iscomputed, columnid, ord...
double precision 执行总时间 (平均值=total_time/calls ) rows bigint 影响的总行数 shared_blks_hit bigint 共享块命中数量 shared_blks_read bigint 共享块读数量 shared_blks_written bigint 共享块写数量 local_blks_hit bigint 本地块命中数量
(device_id); -- get the average measurement across all devices of type 55, parallelized across shards SELECT avg((data->>'measurement')::double precision) FROM events JOIN devices USING (device_id) WHERE device_type_id = 55; ┌────────────────────┐│ avg │├...