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...
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。 real :1E-37~1E+37,precision>=6,4bytes double precision:1E-307~1E+308,precision>=15,8bytes float(precision):float(1)~float(24)=real,float(25)~float(53)=double precision, float=double precision 4.序列号类型...
real variable-precision, inexact 4 bytes 6 decimal digits precision. double precision variable-precision, inexact 8 bytes 15 decimal digits precision serial auto incrementing integer 4 bytes 1 to 2147483647 bigserial large auto incrementing integer 8 bytes 1 to 9223372036854775807Category...
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、char、character
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...
public class PgDoubleTest { public static void main(String[] args) { Connection connection = null; ResultSet resultSet = null; PreparedStatement ps= null; try { // 连接到数据库 connection = DriverManager.getConnection("jdbc:postgresql://192.168.0.6:5432/mydb", "mydb", "test123"); ...
The DOUBLE PRECISION type is also known as the FLOAT type. REAL –guide you on how to use single-precision floating-point numbers in the database. Integer –introduce you to various integer types in PostgreSQL including SMALLINT, INT and BIGINT. DATE – introduce the DATE data type for...
make_time(hour int, min int, sec double precision) 函数通过指定小时、分钟和秒数创建一个时间。 SELECT make_time(1, 2, 30.5); make_time| ---| 01:02:30.5| make_timestamp(year int, month int, day int, hour int, min int, sec double precision) 函数通过指定年、月、日、时、分、...
*/ if (strchr(cp1, '\\') != NULL) *cp2++ = ESCAPE_STRING_SYNTAX; *cp2++ = '\''; while (*cp1) { if (SQL_STR_DOUBLE(*cp1, true)) *cp2++ = *cp1; *cp2++ = *cp1++; } strcpy(cp2, "'::pg_catalog.refcursor"); curname_def->query = pstrdup(buf); curname_def->...
PostgreSQL数据源为您提供读取和写入PostgreSQL双向通道的功能,方便您后续可以通过向导模式和脚本模式配置数据同步任务。本文为您介绍DataWorks的PostgreSQL数据同步能力支持情况。 支持的版本 目前仅支持配置PostgreSQL数据源为PostgreSQL10、11、12、13、14、15版本。您可以通过如下语句查看PostgreSQL数据库的版本。