double:【不精确类型】【定长类型】PG10:十五位有效数字,会四舍五入(PG14十七位有效数字) 代码语言:javascript 代码运行次数:0 运行 AI代码解释 create tablef2(a double precision);insert into f2values(123456789.123456789);insert into f2values(1.1234567890123456789);insert into f2values(12345678901234567890.123456...
如果插入的数值大于(precision-scale)的平方值,会报错如果插入的数值的小数位数多余scale,则会四舍五入。 numeric物理存储上类似于varchar(n),每4个十进制数字2个bytes,再加上5到8个bytes的额外开销。 3.浮点类型(非精确的数值类型) real和double precision不适合做精确的存储和计算。太大或太小的数字都会引发错误。
double precision floating-point number (8 bytes):双精度8字节浮点数 inet ipv4 or ipv6 host address integer int integer int, int4 signed four-byte integer:有符号4字节整数【一般意义上的整数】 inteval interval [ fields ] [ (p) ] time span:时间间隔值 line infinite line on a pla...
numeric user-specified precision, exact variable up to 131072 digits before the decimal point; up to 16383 digits after the decimal point. real variable-precision, inexact 4 bytes 6 decimal digits precision. double precision variable-precision, inexact 8 bytes 15 decimal digits precision serial auto...
PreviousPostgreSQL Character Types: CHAR, VARCHAR, and TEXT NextPostgreSQL DOUBLE PRECISION Data Type Last updated on April 18, 2024 Was this page helpful? YesNo On this page Introduction to PostgreSQL NUMERIC data type NUMERIC, DECIMAL, and DEC types Special values PostgreSQL NUMERIC data type ...
SQL Data Types Numeric规则为SQL numeric类型,包含如下类型:integer【int4】、smallint【int2】、bigint【int8】、real【float4】、double precision【float8】、decimal【numeric】、numeric【numeric】、boolean【bool】。 Numeric: INT_P { $$ = SystemTypeName("int4"); $$->location = @1; } ...
非常详细: FE=> Bind(stmt=null,portal=null,$1=<('48.1'::double precision)>,type=FLOAT8) 三月31, 2024 3:49:55 下午 org.postgresql.core.v3.QueryExecutorImpl sendDescribePortal 非常详细: FE=> Describe(portal=null) 三月31, 2024 3:49:55 下午 org.postgresql.core.v3.QueryExecutorImpl send...
我需要将postresql12.1表中的列数据类型从money更改为double precision。我试过这个: ALTER TABLE "tableName" ALTER "price" TYPE double precision USING price::double precision, ALTER "price" DROP DEFAULT, ALTER "price" SET NOT NULL; 我有个错误: 查询错误(7):错误:无法将类型money转换为字符100的...
pg_catalog | = | double precision | real | boolean | float84eq | equal pg_catalog | = | inet | inet | boolean | network_eq | equal pg_catalog | = | integer | bigint | boolean | int48eq | equal pg_catalog | = | integer | integer | boolean | int4eq | equal ...
blk_read_time|double precision||| 两次快照之间的写数据块耗时 代码语言:javascript 代码运行次数:0 运行 AI代码解释 blk_write_time|double precision||| active session 主要看趋势,直接与业务量挂钩, 如果活跃会话数长时间超过CPU核数时,说明数据库响应变慢了,需要深刻关注。