mysql增加复合索引
ALTER TABLE `gb_send_emails`ADD INDEX `aa` (`email_template_id`, `email_gateway_id`, `emails`) ;create index status_requiresendtime on gb_send_emails (status, require_send_time);
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ALTER TABLE `gb_send_emails`
ADD INDEX `aa` (`email_template_id`, `email_gateway_id`, `emails`) ;
create index status_requiresendtime on gb_send_emails (status, require_send_time);
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