postgresql (PG) 数组函数和操作符

2024-12-13 技术教程

操作符描述例子结果=等于ARRAY[1.1,2.1,3.1]::int[] = ARRAY[1,2,3]t<>不等于ARRAY[1,2,3] <> ARRAY[1,2,4]t<小于ARRAY[1,2,3] < ARRAY[1,2,4]t>大于ARRAY[1,4,3] > ARRAY[1,2,4]t<=小于等于ARRAY[1,2,3] <= ARRAY[1,2,3]t>=大于等于ARRAY[1,4,3] >= ARRAY[1,4,3]t@>包含ARRAY[1,4,3] @> ARRAY[3,1]t<@被包含ARRAY[2,7] <@ ARRAY[1,7,4,2,6]t&&重叠（具有公共元素）ARRAY[1,4,3] && ARRAY[2,1]t||数组和数组串接ARRAY[1,2,3] || ARRAY[4,5,6]{1,2,3,4,5,6}||数组和数组串接ARRAY[1,2,3] || ARRAY[[4,5,6],[7,8,9]]{{1,2,3},{4,5,6},{7,8,9}}||元素到数组串接3 || ARRAY[4,5,6]{3,4,5,6}||数组到元素串接ARRAY[4,5,6] || 7{4,5,6,7}