Create table
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The document discusses database tables, which are made up of rows and columns that intersect to form cells where values are stored. It provides the syntax for creating a table using the CREATE TABLE statement, including column names and data types. The DESC statement is also covered, which is used to describe the columns in a table and view attributes like name, data type, and nullability.
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Aliases in SQL are temporary names given to tables or columns to make them more readable in a query. An alias only exists for the duration of the query. Syntax examples show how to alias a table using a nickname after the table name in a SELECT statement. Column aliases can also be specified by aliasing the table and then referencing columns. Aliases are commonly used in join queries to distinguish columns from different tables that may have the same name.
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The document discusses various "Show" commands in MySQL that can retrieve database, table, and schema information. It explains that SHOW DATABASES lists databases on the server, SHOW TABLES lists tables in a database, and SHOW CREATE TABLE shows the CREATE TABLE statement for a specific table. Examples of syntax are provided for each command, including using LIKE clauses to filter results by database or table name patterns.
V16 sql comments-c
SQL comments are used to explain sections of code or prevent execution. There are two types of comments - single line comments that start with -- and multi-line comments that start with /* and end with */. Single line comments ignore everything after -- on a line, while multi-line comments ignore everything between /* and */.
V15 like operator-c
The LIKE operator is used in a WHERE clause to search for a specified pattern in a column using wildcard characters. It uses two wildcards - the percent sign (%) to match any substring and the underscore (_) to match a single character. The percent sign can match any substring, while the underscore matches any single character. Examples show how the LIKE operator with wildcards can be used to search for names starting with "a" or containing "s_ _ _" in a table.
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Create table
- 1. By : Dhirendra Chauhan
- 2. Table “The Table is combination of Rows and Columns which intersect each other and make cell where we store value. Row/Tuple/Cardinality Columns/Relation/field/Degree Cell
- 3. CREATE TABLE The CREATE TABLE statement allows you to create a new table in a database. Syntax Example CREATE TABLE table_name ( column_1 Data_Type , column_1 Data_Type , :, :, column_1 Data_Type ) ; CREATE TABLE student ( ROLL_NO INT(3) , STUDENT_NAME VARCHAR(50), T_MARKS INT(3), RESULT VARCHAR(10) );
- 5. DESC DESC command describe statements above show the columns in the table and all their attributes such as name, data type, collation, Nullability, Primary key, default, comment, etc. We often use EXPLAIN Syntax: DESC TABLE_NAME; Example DESC STUDENT;
- 6. THANK YOU