在PostgreSQL中,使用FOR循环结构可以在SELECT语句中进行迭代和处理数据。下面是一个使用FOR循环的PostgreSQL SELECT示例: 代码语言:txt 复制 DO $$ DECLARE row record; BEGIN FOR row IN SELECT * FROM table_name LOOP -- 在这里可以对每一行的数据进行处理 -- 例如,可以使用row.column_name来访问每一列的值 ...
1 for each row in (select * from T1 where name = 'David') loop 2 for (select * from T2 where = ) loop 3 If match then pass the row on to the next step 4 If no match then discard the row 5 end loop 6 end loop 1. 2. 3. 4. 5. 6. 具体来说, 如果上述 sql 语句执行循...
/* Open up a cursor for loop, also selecting * the "p" function which will write rows to * t2 for every row fetched from t1. */ FOR crec IN (Select tcol, p(tcol) FROM t1) LOOP -- Break out of the loop immediately EXIT; END LOOP; END; / Select COUNT(*) FROM t2; 注意:%...
FOR i IN 1..10 LOOP -- 循环范围可以根据需求进行调整 -- 执行查询操作 SELECT * INTO result FROM your_table WHERE your_condition; -- 处理查询结果 -- ... END LOOP; END; $$ LANGUAGE plpgsql; 上述代码创建了一个名为loop_query的函数,其中your_table和your_condition需要根据实际情况进行替换。 ...
declare 游标名 cursor [for sql语句];for sql语句表示该游标是否和sql语句进行绑定,如果没有for关键字指定,则表明该游标是未绑定状态举例1:declare mycursor1 cursor; mycursor2 cursor for select * from film; mycursor3 cursor(year integer) for select * from film where release_year=year;(year integer...
PostgreSQL for in loop 模板是 FORvarINREVERSE1..10LOOP statement_list END LOOP; REVERSE 不知道什么意思…… 一般用的是 FORvarIN1..10LOOP statement_listENDLOOP; 如果是navicate for+tab出来的模板,需要自己手动定义值,不然是不生效的。 var是一个变量,它刚开始的时候是等于1..10中的1,可以对var进行...
opencurs1forselectreplace(word,' ','') from spam_keyword; --在loop前打开游标并绑定好范围,query定义范围的时候就把空格都替换掉 <<loop1>> --标签 loop fetch curs1 into str; ifnot foundthenexit; endif; i:=0; --每一次游标完成赋值后就把i初始化为0 ...
for i in 1 .. array_length(res_reportdate,1) loop v_sql := 'insert into ods_t_station_in_single2 select * from ods_t_station_in_single where reportdate ='''||res_reportdate[i]||'''; execute v_sql; end loop; end if; execute...
do language plpgsql $$ declare nsp name; rel name; val int8; begin for nsp,rel in select nspname,relname from pg_class t2 , pg_namespace t3 where t2.relnamespace=t3.oid and t2.relkind='S' loop execute format($_$select last_value from %I.%I$_$, nsp, rel) into val; raise ...
do language plpgsql $$ declare nsp name; rel name; val int8; begin for nsp,rel in select nspname,relname from pg_class t2 , pg_namespace t3 where t2.relnamespace=t3.oid and t2.relkind='S' loop execute format($_$select last_value from %I.%I$_$, nsp, rel) into val; raise ...