MySQL Error 1172 - Result consisted of more than one row

Question

I'm getting this error from MySQL when running a query inside a stored procedure:

Error Code: 1172 Result consisted of more than one row

I understand the error: I'm doing a SELECT (...) INTO (var list), and thus the query is required to return a single row. When I use LIMIT 1 or SELECT DISTINCT, the error goes away.

However: when I run the original query manually (without LIMIT or DISTINCT), it does return a single row. So I'm suspecting I may have bumped into a MySQL bug. Does anyone know what could be happening?

EDIT

I'm posting the SQL as requested. Everything that starts with an underscore is a variable declared earlier inside the procedure. When I test it, I'm replacing _cd_pai_vc with the ID for the record that is causing the problem.

SELECT  a.valor,    IFNULL(p.valor, 0), fn_cd2alias(ra.cd_registro),    fn_cd2alias(IFNULL(p.valor,0))
INTO    _valor,     _cd_pai_vc,         _alias_verbete,                 _alias_pai
FROM dados_registros ra
    INNER JOIN dados_varchar255 a
    ON a.cd_registro = ra.cd_registro
        AND a.fl_excluido = 0
        AND a.alias = 'vc-verbetes-termo'
    LEFT OUTER JOIN dados_registros rp
        INNER JOIN dados_int p
        ON p.cd_registro = rp.cd_registro
            AND p.fl_excluido = 0
            AND p.alias = 'vc-remissoes-termo referenciado'
        INNER JOIN dados_int pt
        ON pt.cd_registro = rp.cd_registro
            AND pt.fl_excluido = 0
            AND pt.alias = 'vc-remissoes-tipo remissao'
            AND fn_cd2alias(pt.valor) = 'hierarquica'
    ON ra.cd_registro = rp.cd_entidade
        AND rp.fl_excluido = 0
        AND fn_cd2alias(rp.cd_modulo) = 'vc-remissoes'
WHERE ra.cd_registro = _cd_pai_vc 
    AND ra.fl_excluido = 0;

Answer 1

I had the similiar issue and when I put table alias it worked like a charm.

SELECT t.tax_amount,t.tax_percentage FROM nepse_tax t

Answer 2

I had this problem and found it went away when I used both table name and column name in select statements, even simple ones.