missing values

sqlite/examples/missing-integer-value.sql

@@ -0,0 +1,10 @@
+CREATE TABLE qa (
+    question TEXT,
+    answer INTEGER
+);
+
+INSERT INTO qa (question, answer) VALUES ('2+2', 4);
+INSERT INTO qa (question, answer) VALUES ('2-2', 0);
+INSERT INTO qa (question) VALUES ('Meaning of life?');
+SELECT * from qa;
+

sqlite/examples/missing-text-value.sql

@@ -0,0 +1,10 @@
+CREATE TABLE qa (
+    question TEXT,
+    answer TEXT
+);
+
+INSERT INTO qa (question, answer) VALUES ('Language?', 'SQL');
+INSERT INTO qa (question, answer) VALUES ('Database?', 'SQLite');
+INSERT INTO qa (question) VALUES ('Meaning of life?');
+SELECT * from qa;
+

sqlite/intro.md

@@ -49,6 +49,27 @@ $ sqlite3 demo.db < autoincrement.sql
 $ rm -f demo.db
 ```
 
+## Missing value
+{id: missing-value}
+
+![](examples/missing-text-value.sql)
+
+```
+$ sqlite3 demo.db < missing-text-value.sql ; rm -f demo.db
+Language?|SQL
+Database?|SQLite
+Meaning of life?|
+```
+
+![](examples/missing-integer-value.sql)
+
+```
+$ sqlite3 demo.db < missing-integer-value.sql ; rm -f demo.db
+2+2|4
+2-2|0
+Meaning of life?|
+```
+
 ## Field with DEFAULT value
 {id: field-with-default-value}