PostgreSQL格式化函数提供一套有效的工具用于把各种数据类型(日期/时间、integer、floating point和numeric)转换成格式化的字符串以及反过来从格式化的字符串转换成指定的数据类型。下面列出了这些函数,它们都遵循一个公共的调用习惯:第一个参数是待格式化的值,而第二个是定义输出或输出格式的模板。
pg_catalog | hash_numeric | integer | numeric | normal pg_catalog | hash_range | integer | anyrange | normal pg_catalog | hashbpchar | integer | character | normal pg_catalog | hashchar | integer | "char" | normal pg_catalog | hashenum | integer | anyenum | normal pg_catalog | ...
...products ( product_no integer NOT NULL, name text NOT NULL, price numeric ); 唯一约束 唯一约束确保一列或者一组列中包含的数据对于表中所有的行都是唯一的...外键约束指定一列或者一组列中的值必须匹配出现在另一个表的某行中的值,以此来维护两个相关表之间的参照完整性。...
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NUMBER(n) NUMERIC(n) NUMBER(n),NUMERIC(n) If n>=19 BINARY_INTEGER, BINARY_FLOAT INTEGER, FLOAT BINARY_INTEGER,INTEGER,FLOAT DATE TIMESTAMP(0) DATE,TIMESTAMP(0) In Oracle the DATE type returns both date and time, whereas in Postgres the DATE type returns the date ...
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As many have noticed, there are a couple of DBMS providers that contribute to the PostgreSQL group - e.g. GreenPlum BizGres, and EnterpriseDB are perhaps two of the most glaring contributers. They build a DBMS that is not a forked version, but one built ontop of the main core, but wit...
Convert Varchar to Numeric Using SSIS 2005 Convert/Cast string data type from file to DT_GUID into table converting 99999999 to date datatype through sql/ssis Converting a string percent value [e.g. 83.12%] to decimal(5,4) [e.g. 0.8312] Converting a string to a integer data type in ...
This allows underscores to be used in integer and numeric literals, and their corresponding type input functions, for visual grouping. For example: 1_500_000_000 3.14159_26535_89793 0xffff_ffff 0b_1001_0001 A single underscore is allowed between any 2 digits, or immediately after the base pr...
paymentattemptscreditcard | integer | | | | plain | | paymentacceptedoutagecredit | integer | | | | plain | | totalmoneyin | numeric(12,2) | | | | main | | updatewhen1 | timestamp without time zone | | | | plain | | updatewhen2 | timestamp without time zone | | | | ...