Oracle 从一个表生成随机字以插入另一个表（PLSQL）

包含我要生成的单词的表

create table words
( word varchar(100));

insert into words values ('Main street');
insert into words values ('Patrick Street');
insert into words values ('Red Street');
insert into words values ('Green street');
insert into words values ('Blue street');
insert into words values ('Yellow street');
insert into words values ('Silver street');
insert into words values ('Gold street');
insert into words values ('Brown street');

用于插入的PLSQL代码

    declare  
randTemp number(10); 
tempCounty VARCHAR(20); 
streetaddress VARCHAR(100);
Begin 
For i in 1..9 
Loop 
randTemp := dbms_random.value(1,5);
SELECT c.countyname INTO tempCounty FROM county C WHERE c.countyid = randTemp;
SELECT w.word INTO streetaddress FROM words w ORDER BY dbms_random.random limit 1; 
Insert into BRANCH values(i,streetaddress,tempCounty,randTemp); 
End loop; 
Commit; 
End; 
/

除此select语句外，所有操作都正常

SELECT w.word INTO streetaddress FROM words w ORDER BY dbms_random.random limit 1;

我得到这个错误

ORA-06550:第10行第75列： PL/SQL:ORA-00933:SQL命令未正确结束

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我认为限制可能是问题所在…？

你说得对，

限制是问题所在，因为Oracle不支持这一点

您可以这样做：

SELECT word INTO streetaddress
FROM (
    SELECT word
    FROM words
    ORDER BY dbms_random.random
)
WHERE rownum = 1;

内部查询对潜在单词进行随机排序，而外部查询使用
rownum
pseudocolumn来选择返回的第一个单词，这与
limit
的操作类似

不过，在循环中重复该查询似乎效率不高；您最好做以下事情：

DECLARE
    tempCounty VARCHAR(20);
    streetaddress VARCHAR2(100);
    cur sys_refcursor;
BEGIN
    OPEN cur FOR
        SELECT word, countyname
        FROM (
            SELECT w.word, c.countyname
            FROM words w
            CROSS JOIN county c
            ORDER BY dbms_random.random
        )
        WHERE rownum <= 9;
    LOOP
        FETCH cur INTO streetaddress, tempCounty;
        EXIT WHEN cur%NOTFOUND;
        dbms_output.put_line(streetaddress ||', '|| tempCounty);
    END LOOP;
END;
/

如果您在PL/SQL中进行更多的处理，并且有很多行，那么使用
批量收集
可能会进一步加快速度。
显然，12c中引入了限制。
INSERT INTO branch
SELECT rownum, word, countyname, countyid
FROM (
    SELECT w.word, c.countyname, c.countyid
    FROM words w
    CROSS JOIN county c
    ORDER BY dbms_random.random
)
WHERE rownum <= 9;