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https://stackoverflow.com/questions/1171196/what-is-the-difference-between-varchar-and-varchar2-in-oracle
VARCHAR is reserved by Oracle to support distinction between NULL and empty string in future, as ANSI standard prescribes. VARCHAR2 does not distinguish between a NULL and empty string, and never will. If you rely on empty string and NULL being the same thing, you should use VARCHAR2.
https://dev.mysql.com/doc/refman/5.7/en/char.html
The CHAR and VARCHAR types are similar, but differ in the way they are stored and retrieved. They also differ in maximum length and in whether trailing spaces are retained. The CHAR and VARCHAR types are declared with a length that indicates the maximum number of characters you want to store. For example, CHAR(30) can hold up to 30 characters.
https://www.databasestar.com/char-varchar-varchar2/
Feb 06, 2017 · CHAR does not need a size specified and has a default of 1. A size needs to be specified with VARCHAR/VARCHAR2 columns. CHAR will pad spaces to the right of strings to match the length of the column, while VARCHAR/VARCHAR2 does not. The performance of CHAR, VARCHAR, and VARCHAR2 is the same. There is no difference in performance with these data ...
https://docs.oracle.com/cd/A57673_01/DOC/server/doc/SCN73/ch6.htm
The CHAR datatype blank-pads and stores trailing blanks up to a fixed column length for all column values, while the VARCHAR2 datatype does not blank-pad or store trailing blanks for column values. Future Compatibility The CHAR and VARCHAR2 datatypes are and will always be fully supported. At this time, the VARCHAR datatype automatically ...
https://forums.mysql.com/read.php?61,2355,2355
Sep 22, 2004 · Dear List, We have some text fields in our Oracle DB application, varchar2(4000). How should we map this in mySQL. The mysql client app. suggests that I should use a blob type.
https://community.oracle.com/thread/280906
Dec 13, 2004 · Hi, Create a table with 2 columns, one with CHAR(10) and the other with VARCHAR(10) and insert a string in each of the columns, say 'hello'. Then you check the length of both the columns, you will see that the CHAR column has lenth 10 and the VARCHAR2 has 5. CHAR will allocate space even if it is having null data but varchar2 will allocate space dynamically based on requirement.
https://www.quora.com/What-is-the-difference-between-Varchar-size-and-Varchar2-size-in-SQL
Apr 18, 2018 · With reference to Oracle Data types of Varchar2 and Varchar VARCHAR2 and VARCHAR Datatypes The [code ]VARCHAR2[/code] datatype stores variable-length character strings. When you create a table with a [code ]VARCHAR2[/code] column, you specify a ma...
https://www.educba.com/mysql-vs-oracle/
There is no support for Stored Procedure in MySQL until version 5. Customizability: Oracle is not customizable as it is closed source. A programmer can modify MySQL to suit individual environment based requirements. Data Partitioning: Oracle supports data partitioning. MySQL does not support data partitions. It requires a server for each set of ...
https://www.quora.com/How-are-VARCHAR-and-VARCHAR2-different
May 22, 2016 · According to google: VARCHAR is reserved by Oracle to support distinction between NULL and empty string in future, as ANSI standard prescribes. VARCHAR2 does not distinguish between a NULL and empty string, and never will. If you rely on empty st...
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