In general, the syntax for granting, denying, and revoking the SHOWPLAN permission is modeled after the other database level permissions. However, some of the GRANT, DENY, and REVOKE clauses that are available with other database-level permissions can not be used with the SHOWPLAN permission....
Given below are the examples of SQL REVOKE: In order to illustrate the use of the REVOKE command, let us first create a user account and then grant it some privileges using the GRANT command. We will use the following SQL statement to create a new role called ‘user_1’. You may renam...
SQL can also forcibly implement the rules for data types, expressions, and texts. Therefore, section "SQL Reference" describes data types, expressions, functions, and operators in addition to SQL syntax. Development of SQL Standards Released SQL standards are as follows: ● 1986: ANSI X3.135-...
Starting with AIR 2.5, the SQL CAST operator is supported when reading to convert BLOB data to ActionScript ByteArray objects. For example, the following code reads raw data that is not stored in the AMF format and stores it in a ByteArray object: stmt.text = "SELECT CAST(data AS ByteAr...
and clear outdated table structures from the table and table definition caches. At this point, it must acquire an exclusive lock. To do so, it waits for current readers to finish, and blocks new reads (and writes).】,但对表的更新、写、删操作会阻塞直到新表准备完毕,原表的临时备份是在新...
1 GRANT SELECT, INSERT, DELETE ON Customers TO 'user';REVOKE: This command is used to take back access privileges from a user.1 REVOKE SELECT, INSERT, DELETE ON Customers FROM 'user';Remember, these are the basic commands to get you started with SQL. The SQL language is quite vast and...
Creates a function.If the parameters or return values of a function have precision, the precision is not checked.When creating a function, you are advised to explicitly s
It's necessary for REVOKE command (to find a field by routine hash element values). Note: It's safe for lower-case-table-names mode too because db name & table name are converted into lower case (see GRANT_NAME::GRANT_NAME). @ mysql-test/include/have_case_insensitive_fs.inc test ...
For example, the administrative statements GRANT and REVOKE for setting up user privileges are dealt with in Chapter 11, "General MySQL Administration." Chapter 12, "Security," provides further details on what privileges are available and what they allow. The syntax for all SQL statements ...
GaussDBprovides a statement for granting rights to data objects and roles. For details, seeGRANT. Revoking Rights GaussDBprovides a statement for revoking rights. For details, seeREVOKE. Setting Default Rights GaussDBallows users to set rights for objects that will be created in the future. For...