Sql

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[1] Is a NULL value same as zero or a blank space?If not then what is the difference?

[2] What is the difference between VARCHARAND CHAR datatypes?

[3] What is a Cursor?

[4] What are LooksAlive” and IsAlive” checks?

[5] What are various DDL commands in SQL?Give brief description of their purposes.?

[6] What are the specific uses of SQL functions?

[7] We shouldn't give ALTER TABLE” permission.?

[8] How to rebuild the system databases?

[9] How do you search for a value in a database table when you don't have the exact value to search for?

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