Statement Insert Comments For Free

In SQL '%' and '_' (underscore sign) are wildcard characters. '%' replaces any number of characters - equivalent to '*' in Linux/Unix and Windows file search. '_' replaces one character - equivalent to '?' in Linux/Unix and Windows file search.

You can comment out or uncomment a single line of code in an SQL statement, multiple adjacent lines of code, a complete SQL statement, or multiple adjacent SQL statements. The syntax for a comment in a line of SQL code is a double hyphen ( -- ) at the beginning of the line.

/* means a start of a multiline comment.

Single line comments start with -- . Any text between -- and the end of the line will be ignored (will not be executed).

The LIKE command is used in a WHERE clause to search for a specified pattern in a column. You can use two wildcards with LIKE : % - Represents zero, one, or multiple characters. _ - Represents a single character (MS Access uses a question mark (?) instead)

Comments can be inserted on a separate line or within a Transact-SQL statement. Multiple-line comments must be indicated by /* and */. A stylistic convention often used for multiple-line comments is to begin the first line with /*, subsequent lines with **, and end with */.

Wildcard Characters in MS Access SymbolDescription*Represents zero or more characters?Represents a single character[]Represents any single character within the brackets!Represents any character not in the brackets2 more rows

The comment tag is used to insert comments in the source code. Comments are not displayed in the browsers. You can use comments to explain your code, which can help you when you edit the source code at a later date.

To comment out in HTML, insert information between <! -- and --> tags (browsers won't show these notes). Commenting in HTML allows developers to leave notes about their code, its functionality or to indicate necessary changes for the future.

You can view the comments on a particular table or column by querying the data dictionary views USER_TAB_COMMENTS , DBA_TAB_COMMENTS , or ALL_TAB_COMMENTS or USER_COL_COMMENTS , DBA_COL_COMMENTS , or ALL_COL_COMMENTS . Specify the name of the operator to be commented.