... select Roles from MyTable where Roles.value('(/root/role)[1]', 'varchar(max)') like 'StringToSearchFor' These pages will show you more about how to query XML in T-SQL: Querying XML fields using t-sql Flattening XML Data in SQL Server EDIT Aft...

I'm testing something in Oracle and populated a table with some sample data, but in the process I accidentally loaded duplicate records, so now I can't create a primary key using some of the columns. ...

...on to that MySQL function. From the MySQL documentation example: If a table contains an AUTO_INCREMENT column and INSERT ... UPDATE inserts a row, the LAST_INSERT_ID() function returns the AUTO_INCREMENT value. If the statement updates a row instead, LAST_INSERT_ID() is not meaningful. However,...

...s better for beginners. No worries about the foreign relationships between tables. Faster than InnoDB on the whole as a result of the simpler structure thus much less costs of server resources. -- Mostly no longer true. Full-text indexing. -- InnoDB has it now Especially good for read-intensive (se...

...to add the column and the foreign key constraint using two separate ALTER TABLE commands: 12 Answers ...

... Clustered Index Only one per table Faster to read than non clustered as data is physically stored in index order Non Clustered Index Can be used many times per table Quicker for insert and update operations than a clustered index Both types of inde...

...acle 11g. However, you can model it easily with a sequence and a trigger: Table definition: CREATE TABLE departments ( ID NUMBER(10) NOT NULL, DESCRIPTION VARCHAR2(50) NOT NULL); ALTER TABLE departments ADD ( CONSTRAINT dept_pk PRIMARY KEY (ID)); CREATE SEQUENCE dept_seq STA...

...ht now even with the "broken" hash functions MD5 and SHA-1. About rainbow tables: The "rainbow attack" is actually cost-sharing of a dictionary or brute force attack. It is a derivative from the time-memory trade-off first described by Hellman in 1980. Assuming that you have N possible passwords (...

... You can sort on multiple columns as per Steve Tjoa's method by using a stable sort like mergesort and sorting the indices from the least significant to the most significant columns: a = a[a[:,2].argsort()] # First sort doesn't need to be stable. a = a[a[:,1].argsort(kind='mergesort')] a = a[a[:,...

... Consider a data structure composed of a hashtable H and an array A. The hashtable keys are the elements in the data structure, and the values are their positions in the array. insert(value): append the value to array and let i be its index in A. Set H[value]=i. remov...