How can I get all table names and column names in SQL?

How can I get all table names and column names in SQL?

Using the Information Schema

1. SELECT TABLE_NAME FROM INFORMATION_SCHEMA. TABLES.
2. SELECT TABLE_NAME, COLUMN_NAME FROM INFORMATION_SCHEMA. COLUMNS.
3. SELECT COLUMN_NAME FROM INFORMATION_SCHEMA. COLUMNS WHERE TABLE_NAME = ‘Album’
4. IF EXISTS( SELECT * FROM INFORMATION_SCHEMA.
5. IF EXISTS( SELECT * FROM INFORMATION_SCHEMA.

How do I get column names in Mongodb?

If you want a single record from a collection, you can use findOne() and in order to get all records from the collection, you can use find(). Display all documents from a collection with the help of find() method. As discussed above find(), it will return all records.

How do I get a list of table names in SQL?

How to Get the names of the table in SQL

1. Syntax (When we have only single database): Select * from schema_name.table_name.
2. Syntax (When we have multiple databases): Select * from database_name.schema_name.table_name.
3. Example: SELECT * FROM INFORMATION_SCHEMA.TABLES.
4. WHERE.
5. INFORMATION_SCHEMA.
6. Output:
7. Attention reader!

What is MongoDB key?

What is Primary Key in MongoDB? In MongoDB, _id field as the primary key for the collection so that each document can be uniquely identified in the collection. When you query the documents in a collection, you can see the ObjectId for each document in the collection.

How to join multiple tables with same column name?

Based on the generalTable.scenario you can look up more details in the other two tables, which are in some columns familiar (expiresAt for example) but in others not. My question is, how to get the joined data of generalTable and the right detailed table in just one query. So, I would like a query like this:

When to use inner joins to join multiple tables?

When you’re using only INNER JOINs to join multiple tables, the order of these tables in joins is not important. The only important thing is that you use appropriate join conditions after the “ON” (join using foreign keys)

How to prefix all column names with the table it?

Everyone would really benefit from having ability to specify custom prefix or/and postfix to fields denoted by ‘dot-star’ (.*). Sample select after adding such feature would be: As you can see, by default prefix or postfix would equal table name (or alias name), and can be overridden with any desired string literal.

How many columns are in a join in MySQL?

I’m analysing a rather horrible legacy database/codebase, trying to reduce server load by combining queries into joins (including an email alert cron job that typically invokes well over a million separate queries). This spits out 120 columns…