array_fill(anyelement, int[], [, int[]])anyarrayreturns an array initialized with supplied value and dimensions, optionally with lower bounds other than 1array_fill(7, ARRAY[3], ARRAY[2])[2:4]={7,7,7} array_length(anyarray, int)intreturns the length of the requested array dimension...
most_common_vals|anyarray|||---高频值 most_common_freqs|real[]|||---高频值的频率 histogram_bounds|anyarray|||---直方图 correlation|real|||---物理顺序和逻辑顺序的关联性 most_common_elems|anyarray|||---高频元素,比如数组 most_common_elem_freqs|real[]|||---高频元素的频率 elem_count_h...
expression operator ANY (array expression) expression operator SOME (array expression) all(array)表达式 expression operator ALL (array expression) 行与行构造器的比较操作表达式 row_constructor operator row_constructor operator is =, <>, <, <=, > or >= row_constructor IS DISTINCT FROM row_const...
any代表任何类型,创建函数非常有用,函数可以接收任何数据类型,指定any Indicates that a function accepts any input data type. anyarray代表任何数组类型 Indicates that a function accepts any array data type (see Section 35.2.5). anyelement Indicates that a function accepts any data type (see Section ...
unnest(anyarray)setof anyelementexpand an array to a set of rowsunnest(ARRAY[1,2]) 1 2 (2 rows) tip7 sql中添加表的时候对于以下敏感字可以加上方括号,而在postgresql中,对于敏感字需要加上双引号如 create table "Table" ( Id serial not null , ...
& text[]:数组中的全部元素是否都是顶层key,或JSON array中的元素 @? jsonpath:JSON数据中是否有jsonpath匹配的元素 @@ jsonpath: 返回jsonpath对JSON数据的断言检查结果,只考虑JSON中第一个匹配的元素,如果返回值不是Boolean类型,则返回NULL 索引 GIN索引可以加快对JSON数据的查询,GIN的默认选项为jsonb_ops,支持?
(gdb) p *root->simple_rel_array[1] $2 = {type = T_RelOptInfo, reloptkind = RELOPT_BASEREL, relids = 0x2c5fdd0, rows = 0, consider_startup = false, consider_param_startup = false, consider_parallel = false, reltarget = 0x2c5fde8, pathlist = 0x0, ppili...
Example 2: How to Use ARRAY_AGG() Function With ORDER BY Clause? In the previous example, we witnessed that the ARRAY_AGG() function retrieves an array of employee names. However, the array elements were not sorted in any order. To sort the array elements ascending or descending, we nee...
generate_subscripts ( array anyarray, dim integer ) → setof integer 生成一个包含给定数组第dim维度的有效下标的序列。 generate_subscripts ( array anyarray, dim integer, reverse boolean ) → setof integer 生成一个包含给定数组第dim维度的有效下标的序列。当reverse为真时,以相反的顺序返回序列。
oid = amopopr WHERE amname = 'gin' AND opcname = 'array_ops' ORDER BY amopstrategy; amopopr | oprcode | amopstrategy ---+---+--- &&(anyarray,anyarray) | arrayoverlap | 1 @>(anyarray,anyarray) | arraycontains | 2 <@(anyarray,anyarray) | arraycontained | 3 =(anyarray,an...