Examples for validating dates in plsql x sexdating ru
All string literals except the null string ('') have datatype Doubling the quotation marks within a complicated literal, particularly one that represents a SQL statement, can be tricky.
For the properties of the datatypes, see "PL/SQL Number Types".
DECLARE howmany NUMBER; num_tables NUMBER; BEGIN -- begin processing SELECT COUNT(*) INTO howmany FROM USER_OBJECTS WHERE OBJECT_TYPE = 'TABLE'; -- Check number of tables num_tables := howmany; -- Compute some other value END; / Notice that comments can appear within a statement at the end of a line.
While testing or debugging a program, you might want to disable a line of code.
The following line is not allowed because the reserved words A delimiter is a simple or compound symbol that has a special meaning to PL/SQL.
For example, you use delimiters to represent arithmetic operations such as addition and subtraction. An identifier consists of a letter optionally followed by more letters, numerals, dollar signs, underscores, and number signs.
If the only difference between identifiers is the case of corresponding letters, PL/SQL considers them the same: -- same as lastname and Last Name The size of an identifier cannot exceed 30 characters.