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SQL

NVL

Oracle NULL-values General-Functions NVL

SQL

SQL UNIQUE Constraint

unique-key primary-key constraints

SQL

SQL PRIMARY KEY Constraint

NULL-values unique-key primary-key constraints

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Phantom reads

transactions range-locks non-repeatable-reads phantom-read isolation

SQL

Phantom reads Example

phantom-read transactions isolation SQL-SERIALIZABLE

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Phantom reads Example

transactions REPEATABLE-READ phantom-read SERIALIZABLE isolation

SQL

Character Sets and Collations

collation binary-collation character-sets

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Character Sets and Collations in General

collation binary-collation character-sets case-insensitive-collation

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Character Sets and Collations in General

MySQL collation character-sets

SQL

SQL Injection

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