Teradata messages pdf
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Deploy ready-to-go solutions in a few clicks. More ways to get started. Migrating data warehouses to BigQuery. Migrating from Netezza. Migrating from Redshift. Migrating from Teradata. Migrating from Snowflake. The series that discusses specifics of transitioning from Teradata consists of the following parts: Schema and data transfer quickstart Query translation overview Query translation quickstart SQL translation reference this document For an overview of transitioning from an on-premises data warehouse to BigQuery on Google Cloud, see the series that begins with Migrating data warehouses to BigQuery: Introduction and overview Data types This section shows equivalents between data types in Teradata and in BigQuery.
Teradata allows you to insert values that have higher precision and rounds the output; however, it keeps the high precision in calculations. This may lead to unexpected rounding behavior compared to the ANSI standard.
Or make sure that you convert time zone information to UTC before exporting. Teradata type formatting Teradata SQL uses a set of default formats for displaying expressions and column data, and for conversions between data types. However, the output format does always show the UTC timezone.
Internally, BigQuery does not have a timezone. Note the following details on differences in the ISO format. Teradata supports arithmetic operators for date types. Not used in BigQuery. Query syntax This section addresses differences in query syntax between Teradata and BigQuery. BigQuery does not use the SEL abbreviation. In BigQuery, columns cannot reference the output of other columns defined within the same select list.
Prefer moving a subquery into a WITH clause. See Comparison operators. BigQuery is always case specific when comparing strings. Such constructs are sometimes used to query date or integer ranges. BigQuery prevents users from inadvertently creating large cross joins. This lets BigQuery parallelize queries. Type conversion and casting BigQuery has fewer but wider data types than Teradata, which requires BigQuery to be stricter in casting. This example returns CAST This example returns 48 See also Comparison operators and column formats.
Aggregate functions The following table maps common Teradata aggregate, statistical aggregate, and approximate aggregate functions to their BigQuery equivalents. NVP Custom user-defined function. The default delimiter is a space character. The default delimiter is a comma. Note: In BigQuery, omitting column names in the INSERT statement only works if values for all columns in the target table are included in ascending order based on their ordinal positions.
In BigQuery, this is not recommended due to the implicit transaction boundary between statements. You can do this with either a query operation or a copy operation. See the Temporary tables section. See the Rollback section. See the Teradata type formatting section. BigQuery always uses UTF-8 encoding. Creates a new view only if the view does not currently exist in the specified dataset.
Indexing for performance Because it's a column-oriented database with query and storage optimization, BigQuery doesn't need explicit indexes. Variable declaration and assignment BigQuery variables are valid during the lifetime of the script.
For details, see Consistency guarantees elsewhere in this document. BigQuery always uses Snapshot Isolation. Multi-statement and multi-line SQL statements Teradata supports transactions sessions , and therefore supports statements separated by semicolons that are consistently executed together.
Error codes and messages Teradata error codes and BigQuery error codes are different. For information about how to handle errors in Scripting, see the sections that follow. Consistency guarantees and transaction isolation Both Teradata and BigQuery are atomic—that is, ACID-compliant on a per-mutation level across many rows.
Transactions Teradata provides either Read Uncommitted allowing dirty reads or Serializable transaction isolation level when running in session mode instead of auto-commit mode. Database limits Always check the BigQuery public documentation for the latest quotas and limits. Maximum number of concurrent sessions per parsing engine PE concurrent queries can be raised with a slot reservation , concurrent API requests per user.
Maximum number of concurrent fast loads 30 default 5 No concurrency limit; jobs are queued. Date values are represented as integers. BigQuery does not use the ANY logical predicate. When comparing strings for equality, Teradata might ignore trailing whitespaces, while BigQuery considers them part of the string. BigQuery prevents users from using subqueries, correlated subqueries, or aggregations in join predicates. Casting a character column in Teradata is sometimes used as a non-standard and non-optimal way to create a padded substring.
Teradata performs many more implicit type conversions and rounding than BigQuery, which is generally stricter and enforces ANSI standards. This example returns Floating point and numeric data types can require special rounding rules when applied with formats such as currencies. DATE - k. Replacing the contents of a table with query output is the equivalent of a transaction. RAISE message. Exception handlers that trigger for certain error conditions are not used by BigQuery.
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