PostgreSQL INSERT INTO 语句用于向表中插入新记录,兼容SQL通用语法。 语法 INSERT INTO 语句语法格式如下: INSERTINTOTABLE_NAME (column1, column2, column3,...columnN)VALUES(value1, value2, value3,...valueN); column1, column2,…columnN 为表中
INSERT INTO RowtoCol VALUES ('张三','语文',73); INSERT INTO RowtoCol VALUES ('张三','数学',86); INSERT INTO RowtoCol VALUES ('张三','物理',99); INSERT INTO RowtoCol VALUES ('李四','语文',78); INSERT INTO RowtoCol VALUES ('李四','数学',98); INSERT INTO RowtoCol VALUES ('李四...
此外,根据Postgresql 插入或者更新操作upsert一文中提到的,在Postgresql9.5之后,提供了原子的upsert语法,不存在则插入,发生冲突可以update Insert语法:官方文档 [ WITH [ RECURSIVE ] with_query [, ...] ] INSERT INTO table_name [ AS alias ] [ ( column_name [, ...] ) ] [ OVERRIDING { SYSTEM | U...
建议大批量的数据入库时,使用 copy,不建议使用 insert,以提高写入速度 postgres=# insert into tdsql_pg_main select t,'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' from generate_series(1,100000) as t; INSERT0100000 Time:9511.755ms postgres=# copy tdsql_pg_main to '/data/pgxz/tdsql_pg_main.txt'; CO...
--创建分区函数CREATEORREPLACEFUNCTIONalarm_partition_trigger()RETURNSTRIGGERAS$$BEGINIFNEW.happen_time>='2020-09-01 00:00:00'andNEW.happen_time<='2020-09-30 23:59:59'THENINSERTINTOtb_test_alarm_2020_09VALUES(NEW.*);ELSIFNEW.happen_time>='2020-10-01 00:00:00'andNEW.happen_time<='202...
CREATE OR REPLACE FUNCTION insert_table () RETURNS trigger VOLATILE AS $pgsql$ declare value1 varchar(50); value2 varchar(50); value3 varchar(3); BEGINif(NEW.dd isnullor NEW.dd != 'A') then value1 :=NEW.aa; value2 :=NEW.bb; ...
Oracle在执行INSERT语句时,可以通过指定NOLOGGING关键字来减少日志记录,提升操作性能。PostgreSQL不支持此关键字。 AS关键字 INSERT INTO 后面不需要添加as关键字,insert into ... as select... 修改为insert into... select... FROM子查询的别名 Oracle中在不引起歧义的情况下子查询可以不带别名,而在PostgreSQL中...
SELECT [ ALL | DISTINCT [ ON ( expression [, ...] ) ] ] * | expression [ AS output_name ] [, ...] INTO [ TEMPORARY | TEMP ] [ TABLE ] new_table [ FROM from_item [, ...] ] [ WHERE condition ] [ GROUP BY expression [, ...] ] [ HAVING condition [, ...] ] [ ...
insert into t_boolean(ifval) values(false); --执行插入 如上可以看到ifval的类型是数值,而insert的值是boolean,自定义函数如下: create or replace function boolean_to_numeric(boolean) returns numeric as $$ select decode($1::boolean,'f'::boolean,0::numeric,'t'::boolean,1::numeric,true); ...
SELECT customer_id, SUM(order_total) AS total_amount FROM orders GROUP BY customer_id; 1. 2. 3. 这个查询将按照customer_id对数据进行分组,并计算每个分组中order_total列的总和。我们使用SUM聚合函数计算总金额,并使用AS关键字为计算结果起个别名total_amount。