In SQL you declare a text value by telling the system how much space to reserve for it. I understand why that was necessary 50 years ago, but I can't imagine today's SQL databases don't use some kind of heap. When I say a value is varchar (255) does that mean in every case it...
`MDFR_ID` varchar(10) COLLATE utf8_bin NOT NULL, ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin ROW_FORMAT=COMPRESSED KEY_BLOCK_SIZE=8 /*!50100 PARTITION BY KEY (SHP_ID) PARTITIONS 10 */ Is /*!50100 ~ */ not comment? what does it mean?Navigate...
String data types, as the name suggests, are used to store strings/texts or blobs of textual information in the database. Depending upon the use case there are different such data types available -CHAR, VARCHAR, BINARY, VARBINARY, TEXT, ENUM, SET & BLOB Let’s understand each of these di...
I looked at the “ORDER BY OPTIMIZATION” section in MySQL manual but could not find a reason why MySQL does not use index in the following scenario: CREATE TABLE table1 ( id bigint(20) NOT NULL AUTO_INCREMENT, a varchar(100) DEFAULT NULL, b varchar(100) DEFAULT NULL, PRIMARY KEY (...
The trigger can be executed when you run one of the following MySQL statements on the table: INSERT, UPDATE and DELETE and it can be invoked before or after the event.You can find a detailed explanation of the trigger functionality and syntax in this article....
1. What are the different data types in SQL Server? SQL Server data types include integers, decimals, floats, char, varchar, text, date, time, datetime, binary, and XML, among others. 2. What are the 5 main data types in databases? 3. How to check data types in SQL? Tell us abo...
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Let's have some fun, shall we? Not many people are doing MySQL procedures, but let's try some. DROPPROCEDUREIFEXISTSadd_post_varchar;DROPPROCEDUREIFEXISTSadd_post_enum;DROPPROCEDUREIFEXISTSadd_post_int; DELIMITER$$CREATEPROCEDUREadd_post_varchar(number_of_postsINT)BEGINDECLAREloop_counterINTUNSIGN...
For more information, seeofficial MySQL documentation. Note The value 50 inVARCHAR(50)indicates the number of characters. The number of bytes that are occupied by the characters varies based on the character set that you use. In the ASCII character set, one...
I am not sure I understand what INNODB's lack of 'FULL TEXT SEARCHING' means exactly. Does this mean it cannot index simple VarChar ids (i.e. 3416EN, 3199EN)? Here's my table CREATE TABLE `active_tracking` ( `entrant_id` int(11) NOT NULL default '0', ...