type null character

One, character set and validation rulesA character set is a set of conformance and encoding, a set of rules that are used to compare characters within a character set, that is, the collation of a character set. MySQL can use the pair of character

In the database, a null value is used to indicate that the actual value is unknown or meaningless. In a table, if a column in a row has no value, it is called NULL ). A null value can be returned for any data type column as long as the non-NULL or

 First look at the following section of code output what:#include int main () { int *p=null; printf ("%s", p); }Output , single-step debugging you can see that the value of executing int *p=null,p is 0x00000000, as you can see, NULL is 0 in

learn the MFC process by writing a Serial port helper toolBecause it has been done several times MFC programming, each time the project is completed, MFC basic operation is clear, but too long time no longer contact with MFC project, again do MFC

Oracle in the database, null values are used to indicate a situation where the actual value is unknown or meaningless. In a table, if a column in a row has no value, it is called a null value (NULL). Columns of any data type can have null values if

MySQL character set ultimate solution [posting]   MySQL, an open-source database, has always been the first choice for small and medium-sized enterprises to build Web applications. In particular, It is a golden partner to cooperate with PHP and

Introduction Database coffer (DBCoffer) is an Oracle data security enhancement product based on the Oracle extension mechanism, featuring high data security, completely transparent applications, and efficient ciphertext access. DBCoffer can prevent

Oracle Character Set and encodingMorven. Huang: C #, ORACLE, etc. oracle handbook Series 10: Character Set, encoding, and Oracle Part 1 Character Set and coding knowledge Character Set: Some characters are collected to one place as needed and

One thousand reasons for not using Null, Null Hong Kong, Null seems to be a headache everywhere. For example, NullPointerException, which is a headache in Java, in order to avoid the unexpected Null pointer exception, for thousands of years,

This will cause the error to be read:Data truncated for column ' X1 ' at row 1This should be a version issue, especially a virtual host.Change the ' to null ' without error:X1 is a double type of data.INSERT into TempTable (x1,x2,x3,x4,x5,x6,x7,x8,x9