The cross database access does allows you to access the objects such as tables, view, synonyms, functions that are available on the same cloud warehouse server. In this article, we will check Snowflake cross database access and it's restrictions. Snowflake Cross Database Access Using cross database access method, you can refer the object present in another database. For example, you can refer function present in another database and use result in the current database. select demo_db..isnumeric(to_variant('hello')) is_numeric; +------------+ | IS_NUMERIC | |------------| | False | +------------+ You can use cross…

The data warehouse combines the data from various sources. Sometimes, data will be corrupted or erroneous values are introduced. For example, you may need to filter out non-numeric values from the salary field. In this article, we will check what is the isnumeric function alternative available in Snowflake. We will also check methods that you can use to validate data or expression. Snowflake isnumeric Function Alternative In a relational database such as SQL Server, isnumeric function is available as a built-in numeric function. But, as of now, Snowflake does not…

Snowflake cloud data warehouse supports the DECODE function which is similar to other relational databases such as Redhift, Netezza, Oracle, SQL Server, etc. The DECODE function is used to implement simple case statements. i.e. you can use it to implement simple if-then-else statement. This command is similar to the Snowflake CASE statement. Snowflake SQL DECODE Function The DECODE function compares the select expression to each search expression in order. As soon as a search expression matches the selection expression, the corresponding result expression is returned. Snowflake SQL DECODE Function Syntax…

In a Snowflake, a transaction is a set of SQL statements, both reads and writes on database objects, that are processed as a unit. All the statements in the transaction are either committed or undone using rolled back as a single unit. Similar to other databases such as Redshift, Netezza, etc, Snowflake transactions guarantees ACID properties. In this article, we will discuss about the Snowflake transaction management using BEGIN, COMMIT and ROLLBACK. Snowflake Transaction Management The default automatic commit behavior of the Snowflake database causes each SQL command that runs…

The INTERVAL data types in Snowflake are handy and widely used types when working with date, time variables. Snowflake supports interval types in the same way as other PostgreSQL databases such as Netezza, Redshift, Vertica, Oracle, etc. In this article, we will check interval types with some common use cases. Snowflake Interval Data Types You can express interval types as a combination of the INTERVAL keyword with a numeric quantity and a supported date part; for example: INTERVAL '1 days' or INTERVAL '10 minutes'. The Snowflake INTERVAL functions are commonly…

The derived columns in Snowflake are columns that are derived from the previously calculated columns in same SELECT statement. In this article, we will check how to reuse previously computed or calculated column in Snowflake. These kind of columns are sometime called lateral column alias. What are derived columns? Derived columns or computed columns are virtual columns that are not physically stored in the table. Their values are re-calculated every time they are referenced in a query. In other word, Derived columns are columns that you derive from other previously…