Postgresql中的dataType 1.整数类型 smallint(int2) 2bytes integer(int,int4) 4bytes bigint(int8) 8bytes 2.任意精度数值 numeric(precision,scale),用于精确的货币和科学计算。 eg:23.5141,precision=6,scale-4 如果指定,precision最大值为1000,如果numeric中没有指定precious,小数点前最多有131072个数字,小数...
Introduction to PostgreSQL integer types To store the whole numbers in PostgreSQL, you can use one of the following integer types: SMALLINT INTEGER BIGINT The following table illustrates the specification of each integer type: NameStorage SizeMinMax SMALLINT 2 bytes -32,768 +32,767 INTEGER 4 by...
sql standard sqlserver postgresql postgresqlaliases description bigint bigint bigint int8 signed eight-byte integer:有符号8字节整数 bigserial serial8 autoinc
coerce_to_target_type函数最终调用了 INT 类型的输入函数int4in,转换过程发现字符串'abc'无法转为 INT。可以执行SELECT int4in('abc')语句直接复现该报错: postgres=# SELECT int4in('abc'); ERROR: invalid input syntax for type integer: "abc" 各种数据类型在语义分析阶段的处理流程是一致的,只是InputFun...
This document discusses PostgreSQL Data Types. While creating table, for each column, you specify a data type, i.e. what kind of data you want to store.This enables several benefits: Consistency: A column can can store a single type of value. So, when you select a column with integer ...
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; } ...
整数类型(integer types) 任意精度类型(arbitrary precision numbers) 浮点数类型(floating-point types) 序列类型(serial types) 金额类型(monetary types) 字符类型(character types) 二进制数据类型(binary data types) 日期/时间类型(date/time types) 布尔类型(boolean type) 枚举类型(enumerated types) 几何类型(...
example_tbl"Column | Type | Collation | Nullable | Default | Storage | Compression | Stats target | Description---+---+---+---+---+---+---+---+---id | integer | | not null | | plain | | |notes | text | | ...
https://www.postgresql.org/docs/14/datatype-numeric.html 为什么说不精确呢?因为数据类型成功插入后,查询出来值可能和你插入的值不一样,原因是长度截断和四舍五入。 精确类型不会发生截断且如果超长了直接报错,主要插入成功了,查出来的一定等于插入的结果。
postgres=# create index idx_test_id on test(id); CREATE INDEX postgres=# \d test Table "public.test" Column | Type | Collation | Nullable | Default ---+---+---+---+--- id | integer | | | name | text | | | Indexes: "idx_test_id" btree (id) postgres=# explain analyze...