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Developer-C 11.1
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CREATE TABLE Objects ( `ID` INTEGER, `Password` VARCHAR(4) ); INSERT INTO Objects (`ID`, `Password`) VALUES ('0', 'aaaa'), ('1', 'bbbb'); CREATE TABLE Events ( `Object` INTEGER, `Date` DATETIME, `Type` INTEGER ); INSERT INTO Events (`Object`, `Date`, `Type`) VALUES ('0', '2020-06-01', '0'), ('0', '2020-06-02', '1');
SELECT ID, IFNULL(e.Type, 1) Type FROM Objects o LEFT JOIN ( SELECT e.Object, e.Type FROM Events e WHERE NOT EXISTS ( SELECT 1 FROM Events WHERE Object = e.Object AND Date > e.Date ) ) AS e ON e.Object = o.ID
ID
Type
0
1
1
1
SELECT o.ID, IFNULL((SELECT e.Type FROM Events e WHERE e.Object = o.ID ORDER BY e.Date DESC LIMIT 1), 1) Type FROM Objects o
ID
Type
0
1
1
1