mysql - 如何在 Mysql 查询中选择随机 ID

Question

SELECT e.ent_seq, 
        GROUP_CONCAT(DISTINCT kei.keb SEPARATOR'; ')AS kebs, 
        GROUP_CONCAT(DISTINCT rei.reb SEPARATOR '; ') AS rebs,
        GROUP_CONCAT(DISTINCT sei.mean SEPARATOR '; ') AS means,
FROM entry e
    LEFT JOIN k_ele kei ON e.entry = kei.entry
    LEFT JOIN r_ele rei ON e.entry = rei.entry
    LEFT JOIN sense se ON e.entry = se.entry 
    LEFT JOIN s_gloss_eng sei ON se.SID = sei.SID
WHERE mn_null = 1
GROUP BY e.entry

如何随机选择e.entry？e.entry 是一个整数。

Answer 1

 SELECT e.ent_seq, 
    GROUP_CONCAT(DISTINCT kei.keb SEPARATOR'; ')AS kebs, 
    GROUP_CONCAT(DISTINCT rei.reb SEPARATOR '; ') AS rebs,
    GROUP_CONCAT(DISTINCT sei.mean SEPARATOR '; ') AS means

FROM entry e

LEFT JOIN k_ele kei ON e.entry = kei.entry
LEFT JOIN r_ele rei ON e.entry = rei.entry
LEFT JOIN sense se ON e.entry = se.entry 
LEFT JOIN s_gloss_eng sei ON se.SID = sei.SID

WHERE e.ent_seq IN (SELECT jt5.jlpt5_seq FROM jlptn5 jt5
                   WHERE jt5.jlpt5_null = 0
                   ORDER BY RAND())
GROUP BY e.entry    
ORDER BY RAND()
LIMIT 20

Answer 2

您可以使用此解决方案 -

SELECT e.ent_seq, 
        GROUP_CONCAT(DISTINCT kei.keb SEPARATOR'; ')AS kebs, 
        GROUP_CONCAT(DISTINCT rei.reb SEPARATOR '; ') AS rebs,
        GROUP_CONCAT(DISTINCT sei.mean SEPARATOR '; ') AS means,
FROM (SELECT * FROM entry ORDER BY RAND() LIMIT 1) e
    LEFT JOIN k_ele kei ON e.entry = kei.entry
    LEFT JOIN r_ele rei ON e.entry = rei.entry
    LEFT JOIN sense se ON e.entry = se.entry 
    LEFT JOIN s_gloss_eng sei ON se.SID = sei.SID
WHERE mn_null = 1
GROUP BY e.entry

如果是表中的字段，则WHERE mn_null = 1向e表别名添加条件。mn_nullentry