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- sqllogictest Introduction – DuckDB 12695
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...e relative file path of the file. The group is the folder that the file is in. The name and group of the test are relevant because they can be used to execute only that test in the unittest group. For example, if we wanted to execute only the above test...zed version of the query, and verifying that the results of these queries are identical. Query verification is very useful because it not only discovers bugs in optimizers, but also finds bugs in e.g., join implementations. This is because the unoptimiz...ed version will typically run using cross products instead. Because of this, query verification can be very slow to do when working with larger data sets. It is therefore recommended to turn... - https://man.mtool.work/duckdb/1.3/dev/sqllogictest/intro.html
- SQL Quirks – DuckDB 11822
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...share of idiosyncrasies and inconsistencies. Some are vestiges of our feathered friend's evolution; others are inevitable because we strive to adhere to the SQL Standard and specifically to PostgreSQL's dialect (see the “PostgreSQL Compatibility” page...xing . Types UINT8 vs. INT8 UINT8 and INT8 are aliases to integer types of different widths: UINT8 corresponds to UTINYINT because it's an 8-bit unsigned integer INT8 corresponds to BIGINT because it's an 8-byte signed integer Explanation: the n in the...PostgreSQL. Extract Functions list_extract / map_extract return NULL on non-existing keys. struct_extract throws an error because keys of structs are like columns. Clauses Automatic Column Deduplication in SELECT Column names are deduplicated with the... - https://man.mtool.work/duckdb/1.3/sql/dialect/sql_quirks.html
- SQL Introduction – DuckDB 11401
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...rk with in the following sections. Alternatively, you can use the COPY statement. This is faster for large amounts of data because the COPY command is optimized for bulk loading while allowing less flexibility than INSERT . An example with weather.csv w...Francisco -194.000 53.000 Observe two things about the result set: There is no result row for the city of Hayward. This is because there is no matching entry in the cities table for Hayward, so the join ignores the unmatched rows in the weather table. W...e will see shortly how this can be fixed. There are two columns containing the city name. This is correct because the lists of columns from the weather and cities tables are concatenated. In practice this is undesirable, though, so you... - https://man.mtool.work/duckdb/1.3/sql/introduction.html
- Subqueries – DuckDB 10964
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...mparison operator all evaluate to true : SELECT 6 <= ALL ( SELECT grade FROM grades ) AS adequate ; returns: adequate true because 6 is less than or equal to each of the subquery results 7, 8 and 9. However, the following query SELECT 8 >= ALL ( SELECT...grade FROM grades ) AS excellent ; returns excellent false because 8 is not greater than or equal to the subquery result 7. And thus, because not all comparisons evaluate true , >= ALL as a...parison results evaluates to true . For example: SELECT 5 >= ANY ( SELECT grade FROM grades ) AS fail ; returns fail false because no result of the subquery is less than or equal to 5. The quantifier SOME maybe used instead of ANY : ANY and SOME are int... - https://man.mtool.work/duckdb/1.3/sql/expressions/subqueries.html
- Indexes – DuckDB 10310
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...processing pipeline. When updating i = 2047 to i = 2048 , we do not yet know that 2048 becomes 2049, and so forth. That is because we have not yet seen that chunk. Thus, we throw a constraint violation. CREATE TABLE my_table ( i INTEGER PRIMARY KEY ); I...e VALUES ( 1 ); UPDATE pk_table SET payload = [ 'world' ] WHERE id = 1 ; Constraint Error: Violates foreign key constraint because key "id: 1" is still referenced by a foreign key in a different table. If this is an unexpected constraint violation, plea...se refer to our foreign key limitations in the documentation The reason for this is because DuckDB does not yet support “looking ahead”. During the INSERT , it is unaware it will reinsert the foreign key value as p... - https://man.mtool.work/duckdb/1.3/sql/indexes.html
- Internal Errors – DuckDB 10092
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...here any further operations will result in the following error message: FATAL Error: Failed: database has been invalidated because of a previous fatal error. The database must be restarted prior to being used again. To continue working with the same dat...abase, start a new DuckDB session on the same database. The reason DuckDB enters “restricted mode” is because the database is in an undefined state. Internal errors are by definition bugs that should never happen so the code path is...DuckDB issue tracker . 関連キーワード DuckDB database issue Internal errors internal within example enters restricted mode because never Documentation Development Copy Markdown Errors signal assertion failure They usually occur unexpected 関連するページ... - https://man.mtool.work/duckdb/1.3/dev/internal_errors.html
- File Access with the file: Protocol – DuckDB 8798
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...//some/path (empty host) file://localhost/some/path ( localhost as host) Note that the following formats are not supported because they are non-standard: file:some/relative/path (relative path) file://some/path (double-slash path) Additionally, the file...ative Documentation Guides Formats Copy Markdown File Access Protocol DuckDB using omitted completely empty Note supported because they 関連するページ MySQL Extension Advanced Installation Methods PostgreSQL Import PostgreSQL Extension WITH Clause Azure... - https://man.mtool.work/duckdb/1.3/guides/file_formats/file_access.html
- CREATE TABLE Statement – DuckDB 8579
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...'a' ); INSERT INTO t2 VALUES ( 1 , 1 ); INSERT INTO t2 VALUES ( 2 , 2 ); Constraint Error: Violates foreign key constraint because key "id: 2" does not exist in the referenced table Foreign keys can be defined on composite primary keys: CREATE TABLE t3...T INTO t4 VALUES ( 1 , 1 , 'a' ); INSERT INTO t4 VALUES ( 2 , 1 , 'b' ); Constraint Error: Violates foreign key constraint because key "id: 1, j: b" does not exist in the referenced table Foreign keys can also be defined on unique columns: CREATE TABLE...keys is currently not supported and will result in the following error: Constraint Error: Violates foreign key constraint because key "..." does not exist in the referenced table. Generated Columns The [type] [GENERATED ALWAYS] AS (expr) [VIRTUAL|STORE... - https://man.mtool.work/duckdb/1.3/sql/statements/create_table.html
- Combining Schemas – DuckDB 8143
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...by_name = true ); Combining Schemas When reading from multiple files, we have to combine schemas from those files. That is because each file has its own schema that can differ from the other files. DuckDB offers two ways of unifying schemas of multiple...t to the SQL construct UNION ALL . Union by Name If you are processing multiple files that have different schemas, perhaps because columns have been added or renamed, it might be desirable to unify the columns of different files by name instead. This ca... - https://man.mtool.work/duckdb/1.3/data/multiple_files/combining_schemas.html
- Timestamp Issues – DuckDB 7940
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...ain the temporal bin values for the time zone in question. The inner casts are not required, but result in a smaller table because date_part returns 64 bit integers for all parts. Notice that we can extract all of the parts with a single call to date_pa...rt . This part list version of the function is faster than extracting the parts one by one because the underlying binning computation computes all parts, so picking out the ones in the list is avoids duplicate calls to th... - https://man.mtool.work/duckdb/1.3/guides/sql_features/timestamps.html
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