tell me about various levels of constraint. : Sql dba

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Can we delete column in sql?

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SELECT flavor, SUM (ice_cream_sales) FROM sales_detail GROUP BY flavor ORDER BY 2 DESC If the "sales_detail" table contains ten records with different values in the flavor column (two "vanilla," three "chocolate," four "strawberry," and one NULL), how many rows are returned by the sample code above? 1. 0 rows 2. 1 row 3. 3 rows 4. 4 rows 5. 10 rows

8 Answers   Sonata,

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How do I truncate a sql log file?

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How do you delete duplicates in sql query using rowid?

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What is the best free sql database?

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how to increment dates by 1 in mysql? : Sql dba

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Is and as keyword in pl sql?

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what will be the output: select 1 from emp union all select 2 from emp;

2 Answers   iNautix,

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how to load data files into tables with 'mysqlimport'? : Sql dba

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When a dml statement is executed, in which cursor attributes, the outcome of the statement is saved?

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What is on delete set null?

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