order by field("FileType",'00','07','02','03') COALESCE函数等价于IFNull CREATEUSER/ROLE name [ [WITH] option [ ... ] ] : 关键词USER,ROLE; name 用户或角色名;whereoption can be: SUPERUSER|NOSUPERUSER :超级权限,拥有所有权限,默认nosuperuser。|CREATEDB|NOCREATEDB :建库权限,默认nocreat...
order by field("FileType",'00','07','02','03') COALESCE函数等价于IFNull CREATE USER/ROLE name [ [ WITH ] option [ ... ] ] : 关键词 USER,ROLE; name 用户或角色名; where option can be: SUPERUSER | NOSUPERUSER :超级权限,拥有所有权限,默认nosuperuser。 | CREATEDB | NOCREATEDB :...
SELECT field1, field2,...fieldN table_name1, table_name2... ORDER BY field1, [field2...] [ASC [DESC]] 1. 2. 使用任何字段来作为排序的条件,从而返回排序后的查询结果。 设定多个字段来排序。 ASC 升序或 DESC降序 。默认升序 可以添加 WHERE...LIKE 子句来设置条件。 MySQL 拼音排序 如果字...
and col.table_schema='你的schema'and c.relname='你的表名'order by 主键位置,字段序号; 英文版(适合写代码) selectc.relnameastable_name,cast(obj_description(c.oid)asvarchar)astable_desc,a.attnumasfield_seq,a.attnameasfield_name,d.descriptionasfield_desc,concat_ws('',t.typname,replace(substr...
split_part(string text, delimiter text, field int) text 根据delimiter分隔string返回生成的第field个子字串(1 Base)。 split_part('abc~@~def~@~ghi', '~@~', 2) def strpos(string, substring) text 声明的子字串的位置。 strpos('high','ig') 2 substr(string, from [, count]) text 抽取子...
SELECT a.attnum, a.attname AS field, t.typname AS type, a.attlen AS length, a.atttypmod AS lengthvar , a.attnotnull AS notnull, b.description AS comment FROM pg_class c, pg_attribute a LEFT JOIN pg_description b ON a.attrelid = b.objoid AND a.attnum = b.objsubid, pg_...
selectcount(*),feildfroma_tablegroupbyfield 表1字段code用逗号分割,表2字段为code和name两列 将表1的字段code分割字段,查询出转换成按表2的name分割 CREATETABLEpublic.tb_test_staff(phonevarchar(64)NOTNULL,staff_namevarchar(64)NOTNULL,project_idtextNULL,CONSTRAINTpk_tb_tb_test_staffPRIMARYKEY(phone))...
\l 连接指定的数据库: \c 数据库名 查看当前实例下的表: \dt 用sql语句方式查询: SELECT tablename FROM pg_tables; 查询某张表的表结构及字段信息 \d tablename--实际表名 用sql语句方式查询: SELECT a.attnum, a.attname AS field, t.typname AS type, a.attlen AS length, a.atttypmod AS leng...
查看当前实例下的表: \dt 用sql语句方式查询: SELECT tablename FROM pg_tables; 查询某张表的表结构及字段信息 \d tablename--实际表名 用sql语句方式查询: SELECT a.attnum, a.attname AS field, t.typname AS type, a.attlen AS length, a.atttypmod AS lengthvar ...
SELECT field1, field2, field3 <![CDATA[ <#> ]]> CAST ( #{featrue} AS vector ) AS "score" FROM test ORDER BY field1 <![CDATA[ <#> ]]> CAST ( #{featrue} AS vector ) LIMIT 10; 符号说明: L2 Distance(<->):L2 距离,也称为欧氏距离或欧几里得距离,用于度量两个向量之间的直线...