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level-0/04-datatypes.md

@@ -1,19 +1,37 @@
 ## SQL DATATYPES
+Most databases have comprehensive documentation on the types they support, and this is a good resource for any needed detail beyond 
+what is presented here. We are focused loosely on the datatypes and their variations.
 
-### GENERAL CATERGORISATION OF DATA TYPES
 
+### GENERAL CATERGORISATION OF DATA TYPES
+Data types in SQL can be summarised as follows:
 
-[Readmore here]()
-### EXAMPLES IN WRITTEN QUERIES
+|S/N|TYPES|
+|----|----|
+|1|Exact Numerics|
+|2|Approximate Numerics|
+|3|Date or Datetime|
+|4|Strings |
+|5|Unicode Strings|
+|6|Binary Strings|
+|7|Others|
 
+[Readmore MSSQL Dataypes here](https://learn.microsoft.com/en-us/sql/t-sql/data-types/data-types-transact-sql?view=sql-server-ver16)
+[Readmore MYSQL Dataypes here]()
+[Readmore POSTGRESQL Dataypes here]()
+[Readmore SQLITE Dataypes here]()
 
 
+### EXAMPLES IN WRITTEN QUERIES
 
-[Readmore here]()
-### EXAMPLES IN OTHER CASES
+CREATE TABLE MyUniqueNames (     
+                FirstName varchar(10),     
+                LastName varchar(10),     
+                CreateDate datetime default GETDATE()     
+                PRIMARY KEY (FirstName,LastName) 
+            )
 
 
-[Readmore here]()
 ### TABLES SUMMARY OF DATATYPES IN SQL
 
 [Readmore here]()