Essential Books

Upper lower case

suggest change 
SELECT UPPER('HelloWorld') --returns 'HELLOWORLD'
SELECT LOWER('HelloWorld') --returns 'helloworld'
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String Functions:
*String Functions
*Concatenate
*Length
*Trim empty spaces
*Upper lower case
*Split
*Replace
*Stuff
*Substring
*REGEXP
*LEFT - RIGHT
*REVERSE
*REPLICATE
*Replace function in sql Select and Update query
*PARSENAME
*INSTR
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