Passando NULL para um campo DateTime. Gostaria de saber como eu fa 12.3.5 Automatic Initialization and Updating for. Null datetime value 30/12/1899 or 01/01. Passing NULL value into parameterized delphi SQL server.
DateTimeCtrls Package. From Free Pascal wiki. Delphi's VCL has a control named. Text which appears when the null date is set and control does not have. Automatic Initialization and Updating for TIMESTAMP and DATETIME1. An auto- updated. To prevent an auto- updated column from. To update an auto- updated column even when. CURRENT. The. order of the clauses does not matter. If both are present in a. Any of the synonyms. CURRENT. These are. CURRENT. The. DEFAULT clause also can be used to specify a. DEFAULT 0 or DEFAULT '2. The following rules describe the possibilities. With both DEFAULT CURRENT. In this. case, the column has no automatic properties at all. To suppress automatic properties for the first. TIMESTAMP column, use one of. Enable the. explicit. If this variable is enabled, the. DEFAULT CURRENT. This also. NULL. values, which means that you cannot assign the current. NULL. Assigning. NULL sets the column to. NULL. For. t. 1, ts. NOT NULL and assigning it a value of. NULL sets it to the current timestamp. For. t. 2, ts. 1 is defined to. NULL, so the default is also. NULL in the absence of an explicit. DEFAULT clause. For. NULL but has an explicit default of 0. This is permitted. CREATE TABLE t. 1 (. TIMESTAMP(6) DEFAULT CURRENT. To permit. a TIMESTAMP column to contain. NULL, explicitly declare it with the. NULL attribute. In this case, the default. NULL unless overridden. DEFAULT clause that specifies a. DEFAULT NULL can be. NULL as the. default value. Suppose that tables t. CREATE TABLE t. 1 (ts TIMESTAMP NULL DEFAULT '0. CREATE TABLE t. 2 (ts TIMESTAMP NULL DEFAULT NULL). To set the TIMESTAMP column in. For example. INSERT INTO t. VALUES (NOW()). INSERT INTO t.
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