Some ESP experiments; Raspi: Only write into the average table if avg values not zero

README.md

@@ -27,10 +27,7 @@ and
 CREATE TABLE average_stats (id MEDIUMINT NOT NULL AUTO_INCREMENT, humidity FLOAT NOT NULL, temperature FLOAT NOT NULL, gm3 float not null, isoutside int not null, created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY (id) );
 ```
 
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-
-
-Show all entries in table: `select * from stats;`
+Show all entries in table: `select * from stats;` or `select * from average_stats;`
 
 ### Compile & Install