Spark sql create table example

In this spark project, we will go through Spark SQL syntax to process the dataset, perform some joins with other supplementary data as well as make the data available for the query using the Spark SQL thrift server. On provision of the data, we will perform some interesting query and other go through some performance tuning technique for Spark SQL.

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Working with SQL at Scale - Spark SQL Tutorial - Databricks

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See the examples below for learning how to convert by using CAST and CONVERT functions. The example of string to int by SQL CAST. The CAST function in SQL can be used as follows: CAST ( expression AS data_type [ ( length ) ] ) Where the expression can be a text/string value, a number etc. that you want to convert into another data type. Oct 15, 2018 · You can also create a table based on a select statement. This makes a table with the same columns and rows as the source query. This operation is known as create-table-as-select (CTAS). This is a handy way to copy one table to another. For example, the following creates toys_clone from toys: create table toys_clone as select * from toys; Easy ...

For the table with a few columns, it is easy to see which columns are already there. However, with a big table with hundred of columns, it is more difficult. In some situations, you want to check whether a column already exists in a table before adding it. However, there is no statement like ADD COLUMN IF NOT EXISTS available.

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