39 lines
1.4 KiB
SQL
39 lines
1.4 KiB
SQL
-- 渠道统计按 tag_id 取去重 external_userid；组合索引避免回表扫描标签关系数据。
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-- 既有库切换统计前应执行一次：php think qywx:backfill-customer-tags --all --fast
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SET @idx_tag_ext_exists := (
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SELECT COUNT(*)
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FROM information_schema.STATISTICS
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WHERE TABLE_SCHEMA = DATABASE()
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AND TABLE_NAME = 'zyt_qywx_external_contact_tag'
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AND INDEX_NAME = 'idx_tag_ext'
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);
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SET @add_idx_tag_ext_sql := IF(
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@idx_tag_ext_exists = 0,
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'ALTER TABLE `zyt_qywx_external_contact_tag` ADD INDEX `idx_tag_ext` (`tag_id`, `external_userid`)',
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'SELECT 1'
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);
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PREPARE add_idx_tag_ext_stmt FROM @add_idx_tag_ext_sql;
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EXECUTE add_idx_tag_ext_stmt;
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DEALLOCATE PREPARE add_idx_tag_ext_stmt;
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-- 渠道选项按标签读取最新名称，覆盖 tag_id + update_time 可避免重复扫描关系表。
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SET @idx_tag_update_exists := (
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SELECT COUNT(*)
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FROM information_schema.STATISTICS
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WHERE TABLE_SCHEMA = DATABASE()
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AND TABLE_NAME = 'zyt_qywx_external_contact_tag'
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AND INDEX_NAME = 'idx_tag_update'
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);
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SET @add_idx_tag_update_sql := IF(
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@idx_tag_update_exists = 0,
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'ALTER TABLE `zyt_qywx_external_contact_tag` ADD INDEX `idx_tag_update` (`tag_id`, `update_time`)',
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'SELECT 1'
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);
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PREPARE add_idx_tag_update_stmt FROM @add_idx_tag_update_sql;
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EXECUTE add_idx_tag_update_stmt;
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DEALLOCATE PREPARE add_idx_tag_update_stmt;
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