Multiple NULLs in unique index

Resolving Oracle Unique Index Issues: Allowing NULL and a SPECIAL_VALUEПодробнее

Understanding the Difference Between a Unique Index and a Primary Key in SQL ServerПодробнее

Enforcing a Unique Index Constraint in MySQL with NULL ValuesПодробнее

Fixing the Unique Index Issue in PostgreSQL: Understanding Null ValuesПодробнее

Creating a UNIQUE INDEX with WHERE Condition in OracleПодробнее

Creating a Unique Constraint in Oracle While Allowing NULL ValuesПодробнее

11000 E11000 duplicate key error index: mydb.users.$phone_1 dup key: { : null } node js MongoDBПодробнее

$11000 E11000 duplicate key error index: mydb.users.$phone_1 dup key: { : null } node js MongoDB$

SQL : How to make unique index constraints on multiple NULLABLE columns?Подробнее

SQL : How to allow NULL value for one column in unique index on multiple columnsПодробнее

SQL UNIQUE Index | UNIQUE INDEX vs UNIQUE KEY | UNIQUE Index vs NOT NULL Constraint | Indexed ViewПодробнее

Databases: Unique Index/Constraint with multiple columns, one column is nullableПодробнее

Databases: MySQL - unique index with nulls - actual solution anyone?Подробнее

Популярное