postgresql Postgres：将单行转换为多行(unpivot)一个SELECT与VALUES表达式的LATERAL连接完成了将列“反旋转...
我不是活跃的HQL用户，但我猜它是太“高级”的操作，不能直接在HQL中实现。它可以被group by + case...
UPDATE, or DELETE operation, either once per modified row, or once per SQL statement.UPDATE triggers can moreover be set to fire only if certain columns are mentioned in the SET clause of the UPDATE statement.Triggers can also fire for TRUNCATE statements.If a trigger event occurs, the tri...
Note: Most PostgreSQL functions acceptconnectionas the optional first parameter. If it is not provided, the last opened connection is used. If it doesn't exist, functions returnFALSE. Note: PostgreSQL automatically folds all identifiers (e.g. table/column names) to lower-case values at object ...
pg_execute— Sends a request to execute a prepared statement with given parameters, and waits for the result pg_fetch_all_columns— Fetches all rows in a particular result column as an array pg_fetch_all— 从结果中提取所有行作为一个数组 pg_fetch_array— 提取一行作为数组 pg_fetch_assoc— ...
13 STRING_SPLIT(str, sep) Split string to rows UNNEST(STRING_TO_ARRAY(str, sep)) 14 SUBSTRING(string, start, length) Return substring SUBSTRING(string, start, length) Datetime functions: SQL Server PostgreSQL 1 CONVERT(DATETIME, expr, style) Converts expr to datetime TO_TIMESTAMP(expr...
totalrowcount:15129, stripe count:1, averagerowsperstripe:15129chunk count:18, containing datafordropped columns:0, zstd compressed:18INFO: statisticsfor"github_columnar_events_p2015_01_01_0200": storage id:10000000004total file size:3579904, total data size:3548221compression rate:8.26x ...
13 STRING_SPLIT(str, sep) Split string to rows UNNEST(STRING_TO_ARRAY(str, sep)) 14 SUBSTRING(string, start, length) Return substring SUBSTRING(string, start, length) Datetime functions: SQL Server PostgreSQL 1 CONVERT(DATETIME, expr, style) Converts expr to datetime TO_TIMESTAMP(expr...
Query OK, 0 rows affected (0.06 sec) PostgreSQL bill=#createtablet4(id serial); CREATE TABLE 2. 时间类型 mysql:mysql中时间相关的类型有日期date、时间time以及datetime、timestamp和year类型。 pg:pg中的时间数据类型基本和mysql一致。区别在于pg中支持timez类型,即带时区的时间类型,这个mysql中不支持,但是...
SQLines tools can help you transfer data, convert database schema (DDL), views, stored procedures, functions, triggers, queries and SQL scripts from PostgreSQL (Postgres) to Oracle. * SQLines SQL Converter - SQL Scripts Conversion and Assessment tool