Jan 15, 2016 · NUMBER(12,0) indicates a numeric data type with precision 12 and scale 0 . A related SO post explains precision and scale further: Precision is ...

Oct 11, 2010 · According to the SQL Specification, a primary key can not contain NULL. This means that decorating a column with either "NOT NULL PRIMARY KEY" ...

Dec 15, 2013 · My question is I could not understand the meaning of "ENABLE" in this statement. What would be the difference if we just define as "NAME" ...

Dec 2, 2012 · A primary key is a combination of columns which uniquely specify a row. A Null value represents lack of value.

May 5, 2012 · A PRIMARY KEY is a unique index where all key columns must be defined as NOT NULL . If they are not explicitly declared as NOT NULL , MySQL ...

Nov 9, 2011 · Yes, no, maybe? The two constraints are different. PK constraint requires a NOT NULL, but does not implies one. Share.

Dec 22, 2008 · ORACLE does not permit NULL values in any of the columns that comprise a primary key. It appears that the same is true of most other "enterprise ...

Apr 26, 2017 · Now says that primary key is not valid because a part of it is nullable. Oracle query: CREATE VIEW ALERTEST."GET_SPMONITORES" AS select ...