PostgreSQL NUMERIC data type examples Let’s take some examples of using the PostgreSQL NUMERIC type. 1) Storing numeric values If you store a value with a scale greater than the declared scale of the NUMERIC column, PostgreSQL will round the value to a specified number of fractional digits. ...
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,小数点后最多有16383个数字。 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...
Numeric Types -https://www.postgresql.org/docs/10/static/datatype-numeric.html 2、货币类型 Monetary Types -https://www.postgresql.org/docs/10/static/datatype-money.html money固定小数点后2位,超过2位长度会四舍五入,仔细看会发现金额前面有货币类型,这个是根据服务端的lc_monetary设置的。 select'12....
| DECIMAL_P opt_type_modifiers { $$ = SystemTypeName("numeric"); $$->typmods = $2; $$->location = @1; } | DEC opt_type_modifiers { $$ = SystemTypeName("numeric"); $$->typmods = $2; $$->location = @1; } | NUMERIC opt_type_modifiers { $$ = SystemTypeName("numeric")...
NUMERIC是PSQL中的另一种固定精度的小数类型,与DECIMAL数据类型非常相似。它也允许您指定小数点前后的位数,并保持精度。与DECIMAL不同,NUMERIC值的存储要求不取决于指定的精度和小数位数。 以下是一个使用NUMERIC数据类型的示例: CREATETABLEorders(totalNUMERIC);INSERTINTOordersVALUES(1000.50);INSERTINTOordersVALUES...
numeric_in函数输入参数为字符串,输出参数为 numeric 类型,函数作用是把原始的字符串转为 numeric 类型; numeric函数输入和输出参数都是 numeric 类型,但是两者的精度可以不同,函数作用是把numeric 类型转换到特定的精度。 postgres=# \df numeric_in List of functions Schema | Name | Result data type | Argumen...
result->choice.n_long.n_sign_dscale=sign|(var->dscale&NUMERIC_DSCALE_MASK);result->choice.n_long.n_weight=weight; NumericChoice,这是union,这能引用同一个存储块。然后最后总的NumericData,这里的vl_len_是对数据所占位计算而来的,计算方法见下。
In this article, we have explored how to work with thenumericdata type in PostgreSQL using Java. We have seen how to connect to a PostgreSQL database using JDBC and perform insert and retrieve operations onnumericvalues. We have also learned how to handle precision and scale when working with...
CREATE TYPE inventory_item AS ( name text, supplier_id integer, price numeric ); 将表字段声明为组合类型 CREATE TABLE on_hand ( item inventory_item, count integer ); INSERT INTO on_hand VALUES (ROW('fuzzy dice', 42, 1.99), 1000); SELECT * FROM on_hand; item | count ---+--- (...
The PostgreSQL time stamp data type is precise down to the microsecond and offers your users the choice to store time and date data with or without time zone information attached. Numeric Numeric data types come in two forms: exact and approximate. Numeric data types that are exact contain ...