Advanced SQL Database Programmers Handbook by Donald K. Burleson, Joe Celko, John Paul Cook, Peter PDF
By Donald K. Burleson, Joe Celko, John Paul Cook, Peter Gulutzan
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Another reason is the emerging need in the financial community to keep all computer time-stamps synchronized, which is where us database people need to start worrying about what we are doing on the Internet and communications networks. com/oracle If you do not add new leap seconds, solar time and atomic time will diverge at the rate of about 2 seconds every 3 years, and after about a century the difference would exceed 1 minute. Think of it as a Y2K problem on a smaller scale. Most commercial software assumes that UT1 is the same as UTC, or that the difference is always less than some value.
I appreciate the fact that programmers have to develop new software, and have to try to keep the existing systems up and running by making repairs to the code that's known to be broken. But how much trouble would be avoided if someone went to the database, looked at trends, and increased or changed things before they broke? Preventive maintenance could be done to the to the database as well as to the source code. For example, imagine that every month the average length of a VARCHAR(n) column in a table is getting longer.
We need a table for the list of words which we want to find: CREATE TABLE SearchList (word VARCHAR(25) NOT NULL PRIMARY KEY); And we need another table for the words that will exclude a document. CREATE TABLE ExcludeList (word VARCHAR(25) NOT NULL PRIMARY KEY); Breaking the problem down into two parts, excluding a document is easy. com/oracle 53 Breaking the problem down into two parts, excluding a document is easy. key_word); This says that you want only the documents that have no matches in the excluded word list.
Advanced SQL Database Programmers Handbook by Donald K. Burleson, Joe Celko, John Paul Cook, Peter Gulutzan