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For the most part, it doesn't matter whether you enter queries using uppercase, lowercase, or mixed case. The following queries are all equivalent:
SELECT USER();
select user();
SeLeCt UsEr();
The examples in this book use uppercase for SQL keywords and function names, and lowercase for database, table, and column names.
When you invoke a function in a query, there must be no space between the function name and the following parenthesis:
mysql> SELECT NOW ();
ERROR 1064: You have an error in your SQL syntax near '()' at line 1
mysql> SELECT NOW();
+---------------------
NOW()
+---------------------
2002-09-01 13:56:36
+---------------------
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