Seeding Random Numbers in PHP
Computers are not that great at creating random numbers as the methods they use are deterministic. That is, they start from a number (called a seed) and apply maths to that number to generate pseudorandom numbers. Most random numbers generated by computers programs use a seed provided by the system, which is generally the current time.
Case Insensitive Like Searches In MySQL
I needed to create a query that did a case insensitive search using the LIKE command in MySQL and I quickly realised that in order to do this I would need to alter both the parameter and the table data to be the same case. This can be done by using the MySQL UPPER() command on the table data and the strtoupper() PHP function on the input data.
Round A Number In MS SQL
To round a number in MS SQL use the ROUND() function. This function takes two parameters, the first is the number to be rounded and the second is the number of decimal places to round the number to. Here is an example of rounding the numbers in a column to the nearest whole integer.
Concatenate Strings In MS SQL
If you want to concatenate the output of three different columns in MS SQL just use the + symbol.
Limit Number Of Rows Returned In MS SQL
To limit the number of rows returned in a MS SQL query you need to use the TOP command. This goes before you name the columns that are to be returned by the SELECT statement.
The following query returns the first 35 rows from a table.
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