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src/pages/latest/delta-faq.mdx

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_In this article:_
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- [What is Delta Lake?](/latest/delta-faq.html#what-is-delta-lake)
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- [What is Delta Lake?](/latest/delta-faq#what-is-delta-lake)
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- [How is Delta Lake related to Apache Spark?](/latest/delta-faq.html#how-is-delta-lake-related-to-apache-spark)
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- [How is Delta Lake related to Apache Spark?](/latest/delta-faq#how-is-delta-lake-related-to-apache-spark)
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- [What format does Delta Lake use to store data?](/latest/delta-faq.html#what-format-does-delta-lake-use-to-store-data)
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- [What format does Delta Lake use to store data?](/latest/delta-faq#what-format-does-delta-lake-use-to-store-data)
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- [How can I read and write data with Delta Lake?](/latest/delta-faq.html#how-can-i-read-and-write-data-with-delta-lake)
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- [How can I read and write data with Delta Lake?](/latest/delta-faq#how-can-i-read-and-write-data-with-delta-lake)
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- [Where does Delta Lake store the data?](/latest/delta-faq.html#where-does-delta-lake-store-the-data)
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- [Where does Delta Lake store the data?](/latest/delta-faq#where-does-delta-lake-store-the-data)
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- [Can I copy my Delta Lake table to another location?](/latest/delta-faq.html#can-i-copy-my-delta-lake-table-to-another-location)
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- [Can I copy my Delta Lake table to another location?](/latest/delta-faq#can-i-copy-my-delta-lake-table-to-another-location)
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- [Can I stream data directly into and from Delta tables?](/latest/delta-faq.html#can-i-stream-data-directly-into-and-from-delta-tables)
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- [Can I stream data directly into and from Delta tables?](/latest/delta-faq#can-i-stream-data-directly-into-and-from-delta-tables)
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- [Does Delta Lake support writes or reads using the Spark Streaming DStream API?](/latest/delta-faq.html#does-delta-lake-support-writes-or-reads-using-the-spark-streaming-dstream-api)
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- [Does Delta Lake support writes or reads using the Spark Streaming DStream API?](/latest/delta-faq#does-delta-lake-support-writes-or-reads-using-the-spark-streaming-dstream-api)
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- [When I use Delta Lake, will I be able to port my code to other Spark platforms easily?](/latest/delta-faq.html#when-i-use-delta-lake-will-i-be-able-to-port-my-code-to-other-spark-platforms-easily)
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- [When I use Delta Lake, will I be able to port my code to other Spark platforms easily?](/latest/delta-faq#when-i-use-delta-lake-will-i-be-able-to-port-my-code-to-other-spark-platforms-easily)
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- [Does Delta Lake support multi-table transactions?](/latest/delta-faq.html#does-delta-lake-support-multi-table-transactions)
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- [Does Delta Lake support multi-table transactions?](/latest/delta-faq#does-delta-lake-support-multi-table-transactions)
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- [How can I change the type of a column?](/latest/delta-faq.html#how-can-i-change-the-type-of-a-column)
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- [How can I change the type of a column?](/latest/delta-faq#how-can-i-change-the-type-of-a-column)
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## What is Delta Lake?
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You can use your favorite Apache Spark APIs to read and write data with
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Delta Lake. See [Read a table](/latest/delta-batch#deltadataframereads) and
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[Write to a table](/latest/delta-batch#deltadataframewrites).
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Delta Lake. See [Read a table](/latest/delta-batch#read-a-table) and
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[Write to a table](/latest/delta-batch#write-to-a-table).
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## Where does Delta Lake store the data?
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Yes, you can use Structured Streaming to directly write data into Delta tables
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and read from Delta tables. See [Stream data into Delta
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tables](/latest/delta-streaming#stream-sink) and [Stream data from Delta
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tables](/latest/delta-streaming#stream-source).
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tables](/latest/delta-streaming#delta-table-as-a-sink) and [Stream data from Delta
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tables](/latest/delta-streaming#delta-table-as-a-source).
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## Does Delta Lake support writes or reads using the Spark Streaming DStream API?
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## How can I change the type of a column?
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Changing a column's type or dropping a column requires rewriting the table. For
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an example, see [Change column type](delta-batch.md#change-column-type).
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an example, see [Change column type](/latest/delta-batch/#change-column-type-or-name).

src/pages/latest/delta-update.mdx

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- `whenMatched` clauses are executed when a source row matches a target table row based on the match condition. These clauses have the following semantics.
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- `whenMatched` clauses can have at most one `update` and one `delete` action. The `update` action in `merge` only updates the specified columns (similar to the `update` [operation](#delta-update)) of the matched target row. The `delete` action deletes the matched row.
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- `whenMatched` clauses can have at most one `update` and one `delete` action. The `update` action in `merge` only updates the specified columns (similar to the `update` [operation](#update-a-table)) of the matched target row. The `delete` action deletes the matched row.
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- Each `whenMatched` clause can have an optional condition. If this clause condition exists, the `update` or `delete` action is executed for any matching source-target row pair only when the clause condition is true.
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- For `updateAll` and `insertAll` actions, the source dataset must have all the columns of the target Delta table. The source dataset can have extra columns and they are ignored.
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If you do not want the extra columns to be ignored and instead want to update the target table schema to include new columns, see [merge schema evolution](#merge-schema-evolution).
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If you do not want the extra columns to be ignored and instead want to update the target table schema to include new columns, see [Automatic schema evolution](#automatic-schema-evolution).
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- For all actions, if the data type generated by the expressions producing the target columns are different from the corresponding columns in the target Delta table, `merge` tries to cast them to the types in the table.
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src/pages/latest/releases.mdx

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| 1.1.x | 3.2.x |
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| 1.0.x | 3.1.x |
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| 0.7.x and 0.8.x | 3.0.x |
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| Below 0.7.0 | 2.4.2 - 2.4._latest_ |
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| Below 0.7.0 | 2.4.2 - 2.4.4 |

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