Differences between INDEX, PRIMARY, UNIQUE, FULLTEXT in MySQL?
What are the differences between PRIMARY, UNIQUE, INDEX and FULLTEXT when creating MySQL tables?
How would I use them?
I'm building a database management tool for a client to use on his own, and I'm having some problem dealing with the possibility of the update of primary/unique keys. So, given that the data for the u
I have the following table: CREATE TABLE IF NOT EXISTS `search` ( `id` BIGINT(16) NOT NULL AUTO_INCREMENT PRIMARY KEY, `string` TEXT NOT NULL, `views` BIGINT(16) NOT NULL, FULLTEXT(string) ) ENGINE=My
When i should use primary key or index? Which are the differences between primary key and index and which is the best?
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Primary key in relational tables. Composite primary key or unique primary key in those pure relational tables? Which design would you recommend to use in MySQL for high performance? See diagram Techni
I'm trying to set up a FULLTEXT index in an existing db table (with like 50k records), with the command below, which worked: ALTER TABLE `record_attributes` ADD FULLTEXT `FULLTEXT` (`content_text` ,`c
I have been entering the following SQL statement, but it has not been turning up any results and I cannot figure out why. The error on phpMyAdmin reads: 1191 - Can't find FULLTEXT index matching the c
I understand what is primary key and unique clustered index my question is why primary key is required when we define unique clustered index. Just considering performance good database design. As per
I have a MySQL MyISAM table with ISBNs. I want to create a UNIQUE index that won't throw duplicate error if the value is empty or null. Is this possible?
Action: creating table record that is a duplicate on a unique key. Good: The unique key is working because the duplicate record is not created. Bad: The mysqli functions that I am using in PHP are no
I'm attempting to add searching support for my PHP web app using MySQL's FULLTEXT indexes. I created a test table (using the MyISAM type, with a single text field a) and entered some sample data. Now
Supose I have a table with several columns. I know how to find duplicates, and then to keep just one record with this expression, adding a combinated index... ALTER IGNORE TABLE part3 ADD UNIQUE INDE
I have a pretty large table with a few million rows: ID (primary) countrycode status flag_cc I tried the following sql statement, but it was quite slow: SELECT id, countrycode, status, flag_cc FROM t
I want to know the differences between different ways for creating hybrid apps. -creating an index.html file with JQUery mobile and load it on the server, so that I can load/link with phonegap in a na
There is no statuscode return when doing index().remove(..) ? but there status code return for index().add(..). There is no requirement to do retry if the remove(..) fail?
Or do I have to create index manually? CREATE TABLE pages( id INTEGER PRIMARY KEY AUTOINCREMENT, stitle TEXT UNIQUE, parent INTEGER, FOREIGN KEY(parent) REFERENCES pages(id) ON DELETE CASCADE ); So I
Should I set the columns to in my table as index or fulltext? They will be searched for both using WHERE and WHERE .. LIKE. Which is best?
I have a fulltext index on my table but am getting weird results... Think a table of current Toys... (huggle buddy is hot apparently at the moment) If a I search for Huggle on my table the results b
What are the differences between dpm() and dsm()?
We have a special kind of table in our DB that stores the history of its changes in itself. So called self-archived table: CREAT TABLE coverages ( id INT, # primary key, auto-increment subscriber_id
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I have a table with a fulltext on one column volltext type is mediumtext. The fulltext index is volltext. I matched words on it like SELECT * FROM `volltextsuche` WHERE MATCH(volltext) AGAINST('+
What are the differences between the following notations? int * arrayA = new int; int arrayB; I am aware that the first line would return a pointer type whereas the second line returns an int
I am having troubles creating a fulltext index on a view in SQL Server 2005. Reviewing the documentation I have not found the problem. The error message I receive is: 'Id' is not a valid index to enf
I am trying to drop an index : DROP INDEX PK_CHARGES but I get an error cannot drop index used for enforcement of unique/primary key why I am getting this ? I will provide further information if
I have an unique index in field mysql. My table is the follow: Id INT(11)(AUTOINCREMENT) login (VARCHAR) (UNIQUE) If I do : INSERT (login) VALUES ('test');//ok, the Id field equal 1 INSERT (login) VA
I am using auto increment value for the inserts in my table. But is there any other way to generate a unique value (which is small enough and not GUID or UUID) in php to insert as primary key in mysql
I want to know the differences between char * and string. for example in this code: char *a; string b; Can anyone help me please?
I have defined primary index on three columns as below primary index ( col1,col2,col3) To query the table using this index will the order of col1,col2,col3 in the predicate matter ?
This question already has an answer here: Difference between Key, Primary Key, Unique Key and Index in MySQL 7 answers Can anyone explain what are the difference between Primary,Unique and Inde
what are the main differences between a clustered index and an index seek?
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I want to make a plural search on my table but i don't want to use FULLTEXT.I tried FULLTEXT but my table doesn't support it.My query is like: SELECT * FROM items WHERE LOWER(items.`name`) LIKE '%para
Consider this scenario, my database table has 300000 rows and has a fulltext index. Whenever a search is done it locks the database and doesn't allow anyone else to login to the portal. Any advice on
I want to create a Mysql-table with some data. All the data is ordered by 3 column entries and all queries rely on these columns, e.g. SELECT * FROM `mytable` WHERE `column1`=0 AND `column2`=0 AND `co
Using SQL Server Management Studio 2008, why can't I see unique index ( not primary key ) when I generate Create Table SQL code? It includes only primary key constraint. Is it by design ? There is a p
I checked this SO post: What's the difference between primary key, unique key, and index in MySQL? and found the statement: Also note that columns defined as primary keys or unique keys are automatic
I have a database of 80,000 rows and as I was testing out some FULLTEXT queries I encountered an unexpected result. I have removed stopwords from MYSQL and have set the minimum word length to 3. When
My purpose: I need to make SELECT WHERE string IN ('...') queries, and string is a VARCHAR (1000) The question: I do not know if I should use a FULLTEXT index for it or just a simple INDEX The problem
I am using MySQL fulltext and PHP (codeigniter) to search a database containing RSS items. Problem is some of these items's titles use underscores instead of spaces. Since MySQL considers underscores
My table is as follows: CREATE TABLE IF NOT EXISTS PHONES ( number VARCHAR(10), id INT, type VARCHAR(10), PRIMARY KEY (number), FOREIGN KEY (id) REFERENCES TECHNICIANS(id) ON DELETE CASCADE ) ENGINE =
When creating an index over a column that is going to be UNIQUE (but not the primary key of the table), SQL server let's me choose a few options: 1) I can choose for it to be a Constraint or an Index.
As I can understand documentation the following definitions are equivalent: create table foo ( id serial primary key, code integer, label text, constraint foo_uq unique (code, label)); create table fo
Recently, My Company's considering to purchase an application using MySQL. the consultant offers two options : running the apps and mysql server on windows 2008 server, or run the mysql server on lin
I’m using JPA and trying to figure out how to create a unique constraint between a primary key column in one table and a non-primary key column in another. I have two tables: Customer ( id character
What are the differences between HasOne() and References() in nhibernate?
Consider the table which contains unique Key and Primary Key .the tables already contains data.If i added any rows to the table i received an error (ORA - 0001) which is due to the duplicate value is
I've the following Table Structure: id bigint(20) loc text lastmod datetime changefreq varchar(15) priority float isdownloaded tinyint(1) mainrepoid bigint(20) FullText is enabled on loc having links
I have tried to use mysql fulltext search in my intranet. I wanted to use it to search in multiple tables, and get the independant results depending on tables in the result page. This is what i did f
Firstly, by using Primary key am I applying the UNIQUE constraint properly? <?php // Make a MySQL Connection mysql_connect(localhost, oassda, oas53a) or die(mysql_error()); mysql_select_db(o