Tutorials by ONLamp.com
John Paul Ashenfelter looks at a specific class of SQL functions that operate on entire columns of data instead of discrete values -- the aggregate functions.
April 4,
2008
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90
Noel Davis shows us buffer overflows in MySQL, analog, vixie cron, and Kerberos IV; problems with kicq, licq, and kaim; root exploits in NetBSD i386 kernels; and insecure coding with PHP and MySQL.
April 4,
2008
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173
The GROUP BY clause is the next step after mastering ORDER BY. John Paul Ashenfelter shows you how to combine database records into a single record to calculate an aggregate function.
April 3,
2008
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167
John Paul Ashenfelter looks at how keys are used to construct relationships between tables in a relational database.
April 2,
2008
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187
Database "keys" help eliminate confusion among records. Here's how to best incorporate these essential identifiers in your database.
March 31,
2008
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160
How well are your database tables communicating with one another? This week John Paul discusses three key relationships: one to one, one to many, and many to many.
March 28,
2008
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205
Noel Davis shows us a buffer overflow in ASPSeek; a denial of service attack against timed; a new version of OpenSSH with many improvements; an attack against the private keys used by GnuPG...
March 27,
2008
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144
The JOIN clause is probably one of the most used -- as well as one of the most confusing -- facets of SQL. John Paul Ashenfelter introduces the JOIN clause.
March 25,
2008
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159
Find yourself wishing PHP had an easy way to manage additional modules? Joao Prado Maia explains PEAR and shows how it fills this role.
March 24,
2008
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141
A look at what's going on behind the scenes when you perform a "join" in MySQL. John Paul Ashenfelter uses the cross join as an example of how joins work in general.
March 20,
2008
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193
