what are null values? : Sql dba

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Write the order of precedence for validation of a column in a table? I. Done using database triggers. Ii. Done using integarity constraints

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what are the differences between require and include, include_once and require_once? : Sql dba

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can a stored procedure call itself or recursive stored procedure? How much level sp nesting is possible? : Sql dba

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how to select alphabets in a one column , for this the table name is PA_TASKS and column name is TASK_NUMBER, In TASK_NUMBER the data like this 1.1.3NN,1.1.4NN,1.5.1NN,1.3.2NE,1.5NN,1NN,1.2NE,1CE , For this i need to disply output as NN,NN,NN,NE,NN,NN,NE,CE, Its some urgent requirement ,thanks in advance

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What is equi join in sql?

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How do you use a while loop in pl sql?

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Write a sql select query that only returns each name only once from a table?

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what is the difference between where clause and having clause? : Sql dba

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Is a secondary key the same as a foreign key?

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How are sql commands classified?

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What is date functions?

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