[英]Column 'date_start' in where clause is ambiguous
我想選擇某個日期,但我對此有疑問
SELECT DISTINCT `clients_agreements`.`date_start` , `buildings`.`id` ,
`buildings`.`street` , `buildings`.`street_nr` ,
`clients`.`building_id` , `clients_agreements`.`user_id`, `clients_agrees_conds`.`user_id`, `clients_agrees_perss`.`client_agreement_id`
FROM `clients_agreements`
LEFT JOIN `buildings`
On `clients_agreements`.`user_id` = `buildings`.`id`
LEFT JOIN `clients`
ON `clients`.`building_id` = `buildings`.`id`
LEFT JOIN `clients_agrees_conds`
ON `clients_agreements`.`user_id` = `clients_agrees_conds`.`user_id`
LEFT JOIN `clients_agrees_perss`
ON `clients_agrees_conds`.`user_id` = `clients_agrees_perss`.`user_id`
WHERE `date_start` = (CURRENT_DATE)
我明白了:
錯誤 #1052 - where 子句中的列“date_start”不明確
Where 子句應包含date_start
別名以指向特定表:
SELECT DISTINCT `clients_agreements`.`date_start` , `buildings`.`id` , `buildings`.`street` , `buildings`.`street_nr` , `clients`.`building_id` , `clients_agreements`.`user_id`, `clients_agrees_conds`.`user_id`, `clients_agrees_perss`.`client_agreement_id`
FROM `clients_agreements`
LEFT JOIN `buildings` On `clients_agreements`.`user_id` = `buildings`.`id`
LEFT JOIN `clients` ON `clients`.`building_id` = `buildings`.`id`
LEFT JOIN `clients_agrees_conds` ON `clients_agreements`.`user_id` = `clients_agrees_conds`.`user_id`
LEFT JOIN `clients_agrees_perss` ON `clients_agrees_conds`.`user_id` = `clients_agrees_perss`.`user_id`
WHERE `clients_agreements`.`date_start` = (CURRENT_DATE)
在您的 where 子句中,在它旁邊添加表名,例如
clients_agreements
。 date_start
= CURRENT_DATE
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