CAST ( expr AS data_type )函数用于将expr转换为data_type数据类型;PostgreSQL类型转换运算符(::)也可以实现相同的功能。例如: selectcast('12'asinteger),'3.1715'::numeric ,'3.1715'::decimal,'2023-03-26'::date;123.17153.17152023-03-26 如果数据
MyTest=# SELECT cast(-44 as bit(12)); bit --- 111111010100 (1 row) MyTest=# SELECT '1110'::bit(4)::integer; int4 --- 14 六、模式匹配: PostgreSQL中提供了三种实现模式匹配的方法:SQL LIKE操作符,更近一些的SIMILAR TO操作符,和POSIX-风格正则表达式。 1. LIKE: string LIKE pattern [ ...
decimal 可变 用户指定精度 无限制 numeric 可变 用户指定精度 无限制 real 4字节 变长,不精确 6位十进制精度 double precision 8字节 变长,不精确 15位十进制精度 smallserial 2字节 smallint自增序列 1~32767 serial 4字节 integer自增序列 1~2147483647 (1-2^31-1) bigserial 8字节 bigInteger自增序列 1...
类型 decimal 和 numeric 是等效的。 oracle(PL/SQL类型)float数据类型(注意:oracle中的float类型是以二进制精度计算的),而postgresql中没有(注意:在实际编写函数或测试sql语句时,在postgresql中定义float不报错,可正常应用,不过最好用double precision代替)。 postgresql中的浮点数类型是real和double precision。 注意:...
38 ⽂档版本:20190827 分析型数据库PostgreSQL版 ⽤⼾指南 / 3 数据库查询和操作 名称 别名 存储⼤小 范围 描述 date 4 bytes 4713 BC - 294,277 AD ⽇历⽇ 期(年,⽉,⽇) decimal [ (p, s) ] numeric [ ( variable p, s) ] double precision float8 8 bytes float ⽆限制 15...
select '5'::int,'2016-1-6'::date,cast('6' as int),cast('2016-1-7' as date) --2.1 布尔类型 --oracle中的boolean不可以和postgresql直接转化,oracle中程序插入true显示为1而pg为t select 't' and 'f' select true or false select ('f...
Previously, you had to specify the type name of the table-valued parameter when calling the procedure, now it is optional. Fixed precision and scale when common type of CASE expression is NUMERIC / DECIMAL . Fixed an issue where sys.dm_exec_sessions may have abandoned entries for already ...
The storage type of the numeric type depends on the precision and scale. 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 ...
For example, you could run a SELECT statement to choose the columns in tableb and cast the decimal column (total) to text: SELECT id, name, total::text FROM me.mydb.tableb; Geometry data types As indicated in the table, ArcGIS creates and can work with three spatial data types in ...
select CAST (payload->>'track_length' AS DOUBLE precision ) from t_table where 1=1 SELECT CAST ('10.2' AS DOUBLE precision); 回到顶部 40. 查看字段类型 pg_typeof() 回到顶部 41. 数组操作 回到顶部 42 查询多个字段 select*fromstarmerx_user_permissionwhere(user_name,location_id,permission_typ...