有一段时间了,外连接的标准符号是 LEFT [OUTER] JOIN 。您的查询应转换为:
LEFT [OUTER] JOIN
select 3 from x_clt_prd c left join x_linea_cred lc on lc.nro_prod = c.nro_prod left join x_linea_cred_priv lcp on lcp.nro_prod = c.nro_prod where c.r_client = @rclient