how synonym works in oracle?
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A synonym is an alternative name for objects such as tables, views, sequences, stored procedures, and other database objects. You generally use synonyms when you are granting access to an object from another schema and you don't want the users to have to worry about knowing which schema owns the object.
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['CREATE – Create an object. ... ', 'DROP – This SQL DDL command helps to delete objects. ... ', 'ALTER – Used to alter the existing database or its object structures.', 'TRUNCATE – This SQL DDL command removes records from tables.', 'RENAME – Renaming the database objects.']
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Initially called SEQUEL (Structured English Query Language) and based on their original language called SQUARE (Specifying Queries As Relational Expressions). SEQUEL was later renamed to SQL by dropping the vowels, because SEQUEL was a trade mark registered by the Hawker Siddeley aircraft company. They are the same.
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Answer: To do this, the Oracle CREATE TABLE syntax is: CREATE TABLE new_table AS (SELECT * FROM old_table WHERE 1=2);
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SQL and PL/SQL are relational database languages. SQL is a structured query language that adds, deletes, modifies or manipulates the data in the database. PL/SQL is a Procedural language which is an extension of SQL, and it holds the SQL statements within its syntax.
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['Inner Join.', 'Left Outer Join.', 'Right Outer Join.', 'Text Join.', 'Referential Join.', 'Temporal Join.']
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['homonym (same + name): a word that sounds like another word.', 'synonym (together + name): a word that means the same as another word.', "antonym (against + name): a word that's the opposite of another word.", 'pseudonym (false + name): a fictitious name for a person.']
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You may have seen Transact-SQL code that passes strings around using an N prefix. This denotes that the subsequent string is in Unicode (the N actually stands for National language character set). Which means that you are passing an NCHAR, NVARCHAR or NTEXT value, as opposed to CHAR, VARCHAR or TEXT.
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HASH joins are the usual choice of the Oracle optimizer when the memory is set up to accommodate them. In a HASH join, Oracle accesses one table (usually the smaller of the joined results) and builds a hash table on the join key in memory.
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'&' vs '&&' in ORACLE “&” is used to create a temporary substitution variable. You will be prompted to enter the value every time the variable is referenced. “&&” is used to create a permanent substitution variable. You need to enter the value only once.
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DDL (Data Definition Language) is a language used by a database management system (like Oracle) that allows users to define the database and specify data types, structures and constraints on the data. Examples DDL statements are: CREATE TABLE, CREATE INDEX, ALTER, and DROP.
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The difference between the project operator (π) in relational algebra and the SELECT keyword in SQL is that if the resulting table/set has more than one occurrences of the same tuple, then π will return only one of them, while SQL SELECT will return all.
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SQL and Oracle are two different things while Oracle is a relational database(RDBMS)Relational database management system - Wikipedia , SQL (SQL - Wikipedia )is a special purpose language used to query the relational database. ... So oracle sql would be a language you will use to query an oracle database.
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Relational Operators. An operator manipulates data elements and returns a result. The data elements that are operated upon are called operands or arguments, and a special character or keyword represents the actual operator. Oracle SQL supports several types of operators, listed in this section.
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The key word ILIKE can be used instead of LIKE to make the match case-insensitive according to the active locale. This is not in the SQL standard but is a PostgreSQL extension. The operator ~~ is equivalent to LIKE , and ~~* corresponds to ILIKE . ... All of these operators are PostgreSQL-specific.
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['axiomatisations24', 'axiomatizations33', 'blaxploitations26', 'chromoxylograph38', 'cytotaxonomists29', 'disintoxicating26', 'disintoxication25', 'juxtapositional31']
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To open a cursor, you use the following syntax: OPEN cursor_name; In this syntax, the cursor_name is the name of the cursor declared in the declaration section. When you open a cursor, Oracle parses the query, binds variables, and executes the associated SQL statement.