PostgreSQL 10.23 Documentationentirely determined by the OVER clause. The rows considered by a window function are those of the “virtual table” produced by the query's FROM clause as filtered by its WHERE, GROUP BY, and HAVING clauses ways using different OVER clauses, but they all act on the same collection of rows defined by this virtual table. We already saw that ORDER BY can be omitted if the ordering of rows is not important. It transformations performed on the table derived in the FROM clause. All these transformations produce a virtual table that provides the rows that are passed to the select list to compute the output rows of the0 码力 | 2727 页 | 11.93 MB | 1 年前3
PostgreSQL 11.22 Documentationentirely determined by the OVER clause. The rows considered by a window function are those of the “virtual table” produced by the query's FROM clause as filtered by its WHERE, GROUP BY, and HAVING clauses ways using different OVER clauses, but they all act on the same collection of rows defined by this virtual table. We already saw that ORDER BY can be omitted if the ordering of rows is not important. It list of columns or expressions to be used as the partition key. The partitioned table itself is a “virtual” table having no storage of its own. Instead, the storage belongs to partitions, which are otherwise-ordinary0 码力 | 2883 页 | 12.34 MB | 1 年前3
PostgreSQL 10.23 Documentationentirely determined by the OVER clause. The rows considered by a window function are those of the “virtual table” produced by the query's FROM clause as filtered by its WHERE, GROUP BY, and HAVING clauses ways using different OVER clauses, but they all act on the same collection of rows defined by this virtual table. We already saw that ORDER BY can be omitted if the ordering of rows is not important. It transformations performed on the table derived in the FROM clause. All these transforma- tions produce a virtual table that provides the rows that are passed to the select list to compute the output rows of the0 码力 | 2590 页 | 12.03 MB | 1 年前3
PostgreSQL 12.17 Documentationentirely determined by the OVER clause. The rows considered by a window function are those of the “virtual table” produced by the query's FROM clause as filtered by its WHERE, GROUP BY, and HAVING clauses ways using different OVER clauses, but they all act on the same collection of rows defined by this virtual table. We already saw that ORDER BY can be omitted if the ordering of rows is not important. It generated columns: stored and virtual. A stored generated column is computed when it is written (inserted or updated) and occupies storage as if it were a normal column. A virtual generated column occupies0 码力 | 2943 页 | 12.61 MB | 1 年前3
PostgreSQL 17beta1 US Documentationentirely determined by the OVER clause. The rows considered by a window function are those of the “virtual table” produced by the query's FROM clause as filtered by its WHERE, GROUP BY, and HAVING clauses ways using different OVER clauses, but they all act on the same collection of rows defined by this virtual table. We already saw that ORDER BY can be omitted if the ordering of rows is not important. It generated columns: stored and virtual. A stored generated column is computed when it is written (inserted or updated) and occupies storage as if it were a normal column. A virtual generated column occupies0 码力 | 3188 页 | 14.32 MB | 1 年前3
PostgreSQL 14.10 Documentationentirely determined by the OVER clause. The rows considered by a window function are those of the “virtual table” produced by the query's FROM clause as filtered by its WHERE, GROUP BY, and HAVING clauses ways using different OVER clauses, but they all act on the same collection of rows defined by this virtual table. We already saw that ORDER BY can be omitted if the ordering of rows is not important. It generated columns: stored and virtual. A stored generated column is computed when it is written (inserted or updated) and occupies storage as if it were a normal column. A virtual generated column occupies0 码力 | 3032 页 | 13.27 MB | 1 年前3
PostgreSQL 12.17 Documentationentirely determined by the OVER clause. The rows considered by a window function are those of the “virtual table” produced by the query's FROM clause as filtered by its WHERE, GROUP BY, and HAVING clauses ways using different OVER clauses, but they all act on the same collection of rows defined by this virtual table. We already saw that ORDER BY can be omitted if the ordering of rows is not important. It generated columns: stored and virtual. A stored generated column is computed when it is written (inserted or updated) and occupies storage as if it were a normal column. A virtual generated column occupies0 码力 | 2786 页 | 12.72 MB | 1 年前3
PostgreSQL 13.14 Documentationentirely determined by the OVER clause. The rows considered by a window function are those of the “virtual table” produced by the query's FROM clause as filtered by its WHERE, GROUP BY, and HAVING clauses ways using different OVER clauses, but they all act on the same collection of rows defined by this virtual table. We already saw that ORDER BY can be omitted if the ordering of rows is not important. It generated columns: stored and virtual. A stored generated column is computed when it is written (inserted or updated) and occupies storage as if it were a normal column. A virtual generated column occupies0 码力 | 2940 页 | 12.89 MB | 1 年前3
PostgreSQL 11.22 Documentationentirely determined by the OVER clause. The rows considered by a window function are those of the “virtual table” produced by the query's FROM clause as filtered by its WHERE, GROUP BY, and HAVING clauses ways using different OVER clauses, but they all act on the same collection of rows defined by this virtual table. We already saw that ORDER BY can be omitted if the ordering of rows is not important. It list of columns or expressions to be used as the partition key. The partitioned table itself is a “virtual” table having no storage of its own. Instead, the storage belongs to partitions, which are otherwise-ordinary0 码力 | 2732 页 | 12.44 MB | 1 年前3
PostgreSQL 9.1.24 Documentation
entirely determined by the OVER clause. The rows considered by a window function are those of the “virtual table” produced by the query’s FROM clause as filtered by its WHERE, GROUP BY, and HAVING clauses means of different OVER clauses, but they all act on the same collection of rows defined by this virtual table. We already saw that ORDER BY can be omitted if the ordering of rows is not important. It table derived in the FROM clause. All these transforma- 83 Chapter 7. Queries tions produce a virtual table that provides the rows that are passed to the select list to compute the output rows of the0 码力 | 2667 页 | 6.57 MB | 1 年前3
共 40 条
- 1
- 2
- 3
- 4













