2021-04-28 18:08:03 +02:00
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Having several levels of nested SQL SELECT statements makes the code difficult to read and should therefore be avoided.
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== Noncompliant Code Example
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With an allowed nesting level of 2:
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----
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*> Non-Compliant
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EXEC SQL
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SELECT * FROM my_table1 WHERE
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my_column1 IN
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(SELECT my_column2 FROM my_table2
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WHERE my_column3 IN
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(SELECT my_column4 FROM my_table3))
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END-EXEC.
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----
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== Compliant Solution
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----
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EXEC SQL
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SELECT * FROM my_table
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END-EXEC.
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----
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