Oracle sql queries pdf download

Still have queries? Skip to content. Master Most in Demand Skills Now! Database Query Pdf Still have queries? It is an keyword in SQL that is used to rename a column or table using an alias name. It is a function that takes the name of a column as argument and counts the number of rows when the column is not NULL.

It is used to create a new table in a database and specify the name of the table and columns inside it. It is a function that takes number of columns as an argument and return the largest value among them. It is a function that takes number of columns as an argument and return the smallest value among them.

It is an operator that is used to filter the result set to contain only the rows where either condition is TRUE. Correlated Subquery — learn about the correlated subquery which is a subquery that depends on the values returned by the outer query.

Section 7. Set Operators This section walks you the steps of using the set operators to combine result sets of two or more independent queries. UNION — show you how to combine the results of two queries into a single result. MINUS — learn how to subtract a result from another. Section 8. More on Groupings Grouping sets — introduce you to the grouping set concepts and show you how to generate multiple grouping sets in a query. ROLLUP — describe how to calculate multiple levels of subtotals across a specified group of dimensions.

PIVOT — show you how to transpose rows to columns to make the crosstab reports. Section 9. MERGE — walk you through the steps of performing a mixture of insertion, update, and deletion using a single statement. Section Data definition This section shows you how to manage the most important database objects including databases and tables. Identity Column — learn how to use the identity clause to define the identity column for a table.

Drop columns — learn how to use various statements to drop one or more columns from a table. Virtual columns — introduce you to virtual columns and how to use them in the database tables. Oracle data types Oracle data types — give you an overview of the built-in Oracle data types.

NUMBER — introduces you to the numeric data type and show you how to use it to define numeric columns for a table. CHAR — learn about fixed-length character string. DATE — discuss the date and time data type and show you how to handle date-time data effectively. Constraints Primary key — explain you to the primary key concept and show you how to use the primary key constraint to manage a primary key of a table.

Foreign key — introduce you to the foreign key concept and show you use the foreign key constraint to enforce the relationship between tables. UNIQUE constraint — discuss how to ensure data stored in a column or a group of columns is unique among rows within the whole table. CHECK constraint — walk you through the process of adding logic for checking data before storing them in tables.

Temporary Tables Global temporary table — learn about the global temporary tables and how to create a new global temporary table. Private temporary table — introduce the private temporary table and how to create a new private temporary table.

I had even mentioned this as one of the top skills in my post about 10 things every programmer should know, if you haven't read that yet, you can read it here, it's completely worth your time.

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