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how to write sql queries

What is SQL? Relational Database Management system(RDBMS) contains many tables . These tables are the basic storage in Database. Tables contains the information about something in the real world for example customers ,employees ,dept Tables in the database contain zero to many rows. SQL which stands for “Structured Query Language” which is pronounced as “SQL” …

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ORA-00911: invalid character

As per OERR,ORA-00911: invalid character Cause: identifiers may not start with any ASCII character other than letters and numbers. $#_ are also allowed after the first character. Identifiers enclosed by double quotes may contain any character other than a double quote. Alternative quotes (q’#…#’) cannot use spaces, tabs, or carriage returns as delimiters. For all …

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