您可以CASE
在select子句中使用。
SELECT name,
SUM(CASE WHEN type = 'red' THEN "count" ELSE 0 END) numred,
SUM(CASE WHEN type = 'blue' THEN "count" ELSE 0 END) numblue
FROM tableName
GROUP BY name
Postgres简单的“数据透视表”表
您可以CASE
在select子句中使用。
SELECT name,
SUM(CASE WHEN type = 'red' THEN "count" ELSE 0 END) numred,
SUM(CASE WHEN type = 'blue' THEN "count" ELSE 0 END) numblue
FROM tableName
GROUP BY name