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Khóa học miễn phí DocumentDB SQL – Parameterized nhận dự án làm có lương

DocumentDB SQL – Parameterized In relational databases, a parameterized query is a query in which placeholders are used for parameters and the parameter values are supplied at execution time. DocumentDB also supports parameterized queries, and parameters in parameterized query can be expressed with the familiar @ notation. The most important reason to use parameterized queries […]

Khóa học miễn phí DocumentDB SQL – Joins nhận dự án làm có lương

DocumentDB SQL – Joins In relational databases, the Joins clause is used to combine records from two or more tables in a database, and the need to join across tables is very important while designing normalized schemas. Since DocumentDB deals with the denormalized data model of schema-free documents, the JOIN in DocumentDB SQL is the […]

Khóa học miễn phí DocumentDB SQL – Aliasing nhận dự án làm có lương

DocumentDB SQL – Aliasing In relational databases, SQL aliases are used to temporarily rename a table or a column heading. Similarly, in DocumentDB, aliases are used to temporarily rename a JSON document, sub-document, object or any field. The renaming is a temporary change and the actual document does not change. Basically, aliases are created to […]