SELECTselect_expressionsINTO [STRICT]targetFROM ...; INSERT ... RETURNINGexpressionsINTO [STRICT]target; UPDATE ... RETURNINGexpressionsINTO [STRICT]target; DELETE ... RETURNINGexpressionsINTO [STRICT]target; 其中target可以是一个记录变量、一个行变量或一个有逗号分隔的简单变量和记录/行域列表。PL/pgS...
('a', 1); insert into users values ('b', 2); insert into users values ('b', 3); CREATE OR REPLACE FUNCTION get_userid(name text) RETURNS int AS $$ #print_strict_params on DECLARE userid int; username text; BEGIN SELECT userid, username INTO userid, username FROM users WHERE ...
declare val text;BEGINselect name into val from a;returnval;END$BODY$LANGUAGEplpgsqlVOLATILECOST100 得到的结果如下显示。返回一行数据,并且这个第一行的排序并不是表的第一行数据。 若是添加strict选项,结果返回的是多条数据就会报错,如下显示。 如果返回的结果刚好是一行数据的,则添加strict选项就可以显示最终...
CREATE [ OR REPLACE ] FUNCTION name ( [ [ arg_name ] arg_type [, ...] ] ) RETURNS ret_type { LANGUAGE lang_name | IMMUTABLE | STABLE | VOLATILE | CALLED ON NULL INPUT | RETURNS NULL ON NULL INPUT | STRICT | [ EXTERNAL ] SECURITY INVOKER | [ EXTERNAL ] SECURITY DEFINER | AS...
随笔分类 - 摘要:PostgreSQL使用select into target时有无STRICT关键字的区别 摘自官方文档http://www.postgres.cn/docs/11/plpgsql-statements.html 43.5.3. 执行一个有单一行结果的查询 一个产生单一行(可能有多个列)的 SQL阅读全文 posted @2020-05-13 16:06gooczb阅读(3573)评论(0)推荐(1)...
insert into testpg SELECT generate_series(1,20000000) as xm, gen_id('1949-01-01', '2023-10-16') as num; 四, 查看测试表 五, pgbench初始化 注意,在初始化前,需要创建pgbench数据库,如何创建就不在这废话了 pgbench -U postgres -i pgbench ...
SELECT id, name FROM runoob PostgreSQL 命令 ABORT ABORT 用于退出当前事务。 ABORT [ WORK | TRANSACTION ] ALTER AGGREGATE 修改一个聚集函数的定义 。 ALTER AGGREGATE _name_ ( _argtype_ [ , ... ] ) RENAME TO _new_name_ ALTER AGGREGATE _name_ ( _argtype_ [ , ... ] ) OWNER TO _new...
SELECT * INTO myrec FROM emp WHERE empname = myname; IF NOT FOUND THEN RAISE EXCEPTION 'employee % not found', myname; END IF; 1. 2. 3. 4. 5. 6. 7. 如果使用了STRICT 选项,查询必须而且只能返回一个数据行,否则系统会报错,错误可能是NO_DATA_FOUND (没有数据行)或TOO_MANY_ROWS (超过...
STRICT AS $function$ select array(select ($1*random())::int from generate_series(1,$2)); $function$; insert into test select random()*1000, gen_arr(500,10) from generate_series(1,10000); 1. 2. 3. 4. 5. 6. 7. 8.
--tsvector类型要求去除重复并排序 with cte1 as( select f from unnest(v_txts) as f group by f ),cte2 as( select f from cte1 order by f )select array_to_tsvector(array_agg(f)) into v_result from cte2; return v_result; end; $$ language plpgsql strict immutable; -- 生成随机中文...