From 4b646f809b5a63e788ef4cbf2048a4a748511b44 Mon Sep 17 00:00:00 2001
From: Kelvin Ferreira <10376375+k30v1n@users.noreply.github.com>
Date: Tue, 25 Jan 2022 15:39:07 -0500
Subject: [PATCH] adding MySql doc on how to generate case insensitive columns

---
 README.md                                     |  1 +
 ...ate_table_with_case_insensitive_columns.md | 57 +++++++++++++++++++
 2 files changed, 58 insertions(+)
 create mode 100644 mysql/how_to_create_table_with_case_insensitive_columns.md

diff --git a/README.md b/README.md
index 5de6919..e7f6996 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,7 @@ Repo to hold important notes, links and guides to help throughout the carrer
 1. [How to run performance test with locust](/locust/how_to_run_performance_test_with_locust.md)
 
 ## MySQL
+1. [How to create table with case insensitive columns](/mysql/how_to_create_table_with_case_insensitive_columns.md)
 1. [How to insert blob](/mysql/how_to_insert_blob.md)
 
 ## Powershell
diff --git a/mysql/how_to_create_table_with_case_insensitive_columns.md b/mysql/how_to_create_table_with_case_insensitive_columns.md
new file mode 100644
index 0000000..822b2d4
--- /dev/null
+++ b/mysql/how_to_create_table_with_case_insensitive_columns.md
@@ -0,0 +1,57 @@
+# How to create table with case insensitive columns
+
+MySQL includes character set support that enables you to store data using a variety of character sets and perform comparisons according to a variety of collations. The default MySQL server character set and collation are utf8mb4 and utf8mb4_0900_ai_ci, but you can specify character sets at the server, database, table, column, and string literal levels.
+
+- [Chapter 10 Character Sets, Collations, Unicode](https://dev.mysql.com/doc/refman/8.0/en/charset.html)
+- [10.3 Specifying Character Sets and Collations](https://dev.mysql.com/doc/refman/8.0/en/charset-syntax.html)
+- [10.3.1 Collation Naming Conventions](https://dev.mysql.com/doc/refman/8.0/en/charset-collation-names.html)
+
+Every “character” column (that is, a column of type CHAR, VARCHAR, a TEXT type, or any synonym) has a column character set and a column collation. Column definition syntax for CREATE TABLE and ALTER TABLE has optional clauses for specifying the column character set and collation:
+
+```sql
+col_name {CHAR | VARCHAR | TEXT} (col_length)
+    [CHARACTER SET charset_name]
+    [COLLATE collation_name]
+```
+These clauses can also be used for ENUM and SET columns:
+
+```sql
+col_name {ENUM | SET} (val_list)
+    [CHARACTER SET charset_name]
+    [COLLATE collation_name]
+```
+
+
+Examples
+```sql
+CREATE TABLE t1
+(
+    col1 VARCHAR(5)
+      CHARACTER SET latin1
+      COLLATE latin1_german1_ci
+);
+
+
+ALTER TABLE t1 MODIFY
+    col1 VARCHAR(5)
+      CHARACTER SET latin1
+      COLLATE latin1_swedish_ci;
+
+
+CREATE TABLE t2
+(
+    col1 CHAR(10) CHARACTER SET utf8 COLLATE utf8_unicode_ci
+) CHARACTER SET latin1 COLLATE latin1_bin;
+
+CREATE TABLE t3
+(
+    col1 CHAR(10) CHARACTER SET utf8
+) CHARACTER SET latin1 COLLATE latin1_bin;
+```
+
+[10.3.5 Column Character Set and Collation](https://dev.mysql.com/doc/refman/8.0/en/charset-column.html)
+
+
+In MySQL(5.7) we can create a table with case insensitive columns by using  "COLLATE  utf8mb4_unicode_ci" in the column definition.
+
+In MySQL(8.0) and up we can create a table with Case insensitive and Accent sensitive columns by declaring  "COLLATE  utf8mb4_0900_as_ci" in the column definition.