MySQL查詢按列名選擇表名

Question

我正在嘗試從指定數據庫中選擇包含列'lang'和'project'的所有表。 這就是我正在做的事情：

SELECT DISTINCT(ISC1.TABLE_NAME) AS `table` FROM INFORMATION_SCHEMA.COLUMNS AS ISC1 
JOIN INFORMATION_SCHEMA.COLUMNS AS ISC2 ON 
    (ISC1.TABLE_SCHEMA=ISC2.TABLE_SCHEMA AND ISC1.TABLE_NAME=ISC2.TABLE_NAME AND ISC2.COLUMN_NAME='project') 
WHERE ISC1.COLUMN_NAME='lang' AND ISC2.COLUMN_NAME='project' AND ISC1.TABLE_SCHEMA='some_database'

• 它確實有效，但我覺得寫這種查詢是一種不好的方式。 如果有人可以改進，那就太好了。
• 現在我必須更改此查詢以選擇所有具有“lang”列但沒有“project”列的表。 說實話，我無法弄清楚從哪里開始......

謝謝你的幫助

Answer 1

SELECT DISTINCT(ISC1.TABLE_NAME) AS `table`
FROM INFORMATION_SCHEMA.COLUMNS AS ISC1,
    INFORMATION_SCHEMA.COLUMNS AS ISC2 
WHERE ISC1.TABLE_SCHEMA=ISC2.TABLE_SCHEMA
AND ISC1.TABLE_NAME=ISC2.TABLE_NAME
AND ISC2.COLUMN_NAME='project'
AND ISC1.COLUMN_NAME='lang'
AND ISC1.TABLE_SCHEMA='some_database'

沒有項目列：

SELECT DISTINCT(ISC.TABLE_NAME) AS `table`
FROM INFORMATION_SCHEMA.COLUMNS AS ISC
WHERE ISC.COLUMN_NAME='lang'
AND ISC.TABLE_SCHEMA='some_database'
AND NOT EXISTS(SELECT *
    FROM INFORMATION_SCHEMA.COLUMNS C
    WHERE C.COLUMN_NAME = 'project'
    AND C.TABLE_NAME=ISC.TABLE_NAME
    AND C.TABLE_SCHEMA=ISC.TABLE_SCHEMA)