Illegal mix of collations (utf8_general_ci,IMPLICIT) – MySQL

— Preparations SET SESSION group_concat_max_len=4294967295; SET SESSION foreign_key_checks=0; — Set default character sets and collations ALTER DATABASE dwdata CHARACTER SET utf8 COLLATE utf8_general_ci; ALTER DATABASE dwnotification CHARACTER SET utf8 COLLATE utf8_general_ci; ALTER DATABASE dwsystem CHARACTER SET utf8 COLLATE utf8_general_ci; ALTER DATABASE dwworkflowengine CHARACTER SET utf8 COLLATE utf8_general_ci; — Create statement that adjusts collations for tables in dwdata SELECT GROUP_CONCAT(CONCAT(‘ALTER TABLE ‘, TABLE_SCHEMA, ‘.’, TABLE_NAME, ‘ CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;’) SEPARATOR ‘\n’) AS “Prepared statement” FROM INFORMATION_SCHEMA.TABLES…

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How to Change Schema of Mssql Tables, Stored Procedures, and Views All at the Same Time

Sometimes changing database users changes who the database owner is for a table from dbo.tablename to badschema.tablename. This will also affect any stored procedures created under the tables with the incorect schema.  If you need to change the schema for these tables back to the default dbo schema follow the steps below. Open Microsoft SQL Server Management Studio and log in. Click the New Query button. Paste the following script into the New Query box changing oldschema to the name of the current schema:…

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What is – DML, DDL, DCL and TCL – Introduction

DML DML is abbreviation of Data Manipulation Language. It is used to retrieve, store, modify, delete, insert and update data in database. Examples: SELECT, UPDATE, INSERT statements DDL DDL is abbreviation of Data Definition Language. It is used to create and modify the structure of database objects in database. Examples: CREATE, ALTER, DROP statements DCL DCL is abbreviation of Data Control Language. It is used to create roles, permissions, and referential integrity as well it is used to control access to database…

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Find Duplicate Values with SQL Script

Let’s assume that data has been entered in a table and now you want to find if a table column have duplicated values. Here is an SQL script to join data from one table for comparison purpose. The table must have a primary key column (unique column) and the second column for comparison. Here is a sample script: Details: – DWDOCID is the primary key column – AIXFlag, is just a fixed value (optional) – SAMPLEEN is the table…

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T/SQL Splint String/Text

One common task performed in database applications is given a full name, how can this be split into the first name and last name.  In this article, three different methods are discussed to perform this task using three different functions in SQL Server.  It is assumed in this article that the full name is just made up of one first name and one last name. Using SUBSTRING Function The first method is the use of the SUBSTRING string function,…

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T/SQL Generate Random Numbers

SQL Server has a built-in function that generates a random number, the RAND() mathematical function.  The RAND math function returns a random float value from 0 through 1.  It can take an optional seed parameter, which is an integer expression (tinyint, smallint or int) that gives the seed or start value. To use it, you can simply do a simple SELECT, as follows: SELECT RAND() AS The result generated by this SELECT statement is as follows (note that…

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