Results of 1 - 10 of about 11 for Logically (0.001 sec.)
- SELECT Statement 13940
- The SELECT statement retrieves rows from the database. Examples Select all columns from the table tbl : SELECT * FROM tbl; Select the rows from tbl : SELECT j FROM tbl WHERE i = 3; Perform an aggregate grouped by the column i : SELECT i, su
...The SELECT clause specifies the list of columns that will be returned by the query. While it appears first in the clause, logically the expressions here are executed only at the end. The SELECT clause can contain arbitrary expressions that transform the...details. FROM Clause The FROM clause specifies the source of the data on which the remainder of the query should operate. Logically, the FROM clause is where the query starts execution. The FROM clause can contain a single table, a combination of multipl...ecifies any filters to apply to the data. This allows you to select only a subset of the data in which you are interested. Logically the WHERE clause is applied immediately after the FROM clause. GROUP BY and HAVING Clauses The GROUP BY clause specifies w... - https://man.mtool.work/duckdb/2.0/sql/statements/select.html
- WHERE Clause 10028
- The WHERE clause specifies any filters to apply to the data. This allows you to select only a subset of the data in which you are interested. Logically the WHERE clause is applied immediately after the FROM clause. Examples Select all rows
... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/where.html
- LIMIT and OFFSET Clauses 9246
- LIMIT is an output modifier. Logically it is applied at the very end of the query. The LIMIT clause restricts the amount of rows fetched. The OFFSET clause indicates at which position to start reading the values, i.e., the first OFFSET valu
... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/limit.html
- JSON Type 8979
- DuckDB supports json via the JSON logical type. For example: SELECT '[1, null, {"key": "value"}]'::JSON; [1, null, {"key": "value"}] Logically, the JSON type is similar to a VARCHAR , but with the restriction that it must be valid JSON. Phy
... - https://man.mtool.work/duckdb/2.0/data/json/json_type.html
- NULL Values 8713
- NULL values are special values that are used to represent missing data in SQL. Columns of any type can contain NULL values. Logically, a NULL value can be seen as “the value of this field is unknown”. A NULL value can be inserted to any fie
... - https://man.mtool.work/duckdb/2.0/sql/data_types/nulls.html
- ORDER BY Clause 8197
- ORDER BY is an output modifier. Logically it is applied near the very end of the query (just prior to LIMIT or OFFSET , if present). The ORDER BY clause sorts the rows on the sorting criteria in either ascending or descending order. In addi
... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/orderby.html
- Result Verification 7930
- The standard way of verifying results of queries is using the query statement, followed by the letter I times the number of columns that are expected in the result. After the query, four dashes ( ---- ) are expected followed by the result v
...These can be used to verify that different queries provide the same result. This is useful for comparing queries that are logically equivalent, but formulated differently. Query labels are provided after the connection label or sorting specifier. Queries... - https://man.mtool.work/duckdb/2.0/dev/sqllogictest/result_verification.html
- Execution Format 7930
- Vector is the container format used to store in-memory data during execution. DataChunk is a collection of Vectors, used for instance to represent a column list in a PhysicalProjection operator. Data Flow DuckDB uses a vectorized query exec
...y referred to in the code as STANDARD_VECTOR_SIZE . The default STANDARD_VECTOR_SIZE is 2048 tuples. Vector Format Vectors logically represent arrays that contain data of a single type. DuckDB supports different vector formats , which allow the system to... - https://man.mtool.work/duckdb/2.0/internals/vector.html
- SELECT Clause 7930
- The SELECT clause specifies the list of columns that will be returned by the query. While it appears first in the clause, logically the expressions here are executed only at the end. The SELECT clause can contain arbitrary expressions that
... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/select.html
- Enum Data Type 7663
- Name Description ENUM Dictionary representing all possible string values of a column The enum type represents a dictionary data structure with all possible unique values of a column. For example, a column storing the days of the week can be
...st(⟨constant string⟩, enum_type) so that physically we are doing an integer comparison instead of a string comparison (but logically it is still a string comparison): SELECT * FROM person WHERE current_mood = 'sad'; -- Equivalent to `WHERE current_mood::V... - https://man.mtool.work/duckdb/2.0/sql/data_types/enum.html
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